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Welcome to download from App Store: iNFC

https://apps.apple.com/cn/app/infc/id1562054959

1. iNFC official store:

https://shop186988287.taobao.com/

2. The strongest version of Pixl OLED lithium battery:

https://m.tb.cn/h.53TPS9J?tk=pdx4dxmARaI

3. Chamleon Pro Ultra/Panda Third Generation Pro Edition:

https://m.tb.cn/h.57vShaN?tk=C7KEWclzHne

4. Search iNFC in App Store, or click to jump:

https://apps.apple.com/cn/app/infc/id1562054959

5. TG channel:

https://t.me/iLocalizable

6. TG customer service group:

https://t.me/NFCMaster

7. Amiibo data subscription link in mainland China:

https://gitee.com/newsagency/iNFCAmiibo/raw/master/amiibo.infc

8. Amiibo data subscription link outside mainland China:

https://raw.githubusercontent.com/strengthen/iNFCAmiibo/main/amiibo.infc

9. Download Gitee firmware in mainland China:

https://gitee.com/newsagency/iNFCAmiibo/tree/master/Firmware/Pixl

10. Github firmware download for non-mainland areas:

https://github.com/strengthen/iNFCAmiibo/tree/main/Firmware/Pixl

11. DFU web page upgrade:

https://thegecko.github.io/web-bluetooth-dfu/examples/web.html

12. DUF Chinese version APK:

https://pan.baidu.com/s/1B4MXwPO-lJZINmyTJKKppw?pwd=c2sa

13. Bilibili video homepage:

https://space.bilibili.com/9168196

14. YouTube channel:

https://www.youtube.com/channel/UCXCZyO875Mr4vjDrWgHyUkA

15. Customer service Q group: 887413967

16. Customer service WeChat ID: iNFC-Developer

Supports 15 programming languages, sorted alphabetically.

| Bash | C | C++ | C# | Go | Java | JavaScript | Kotlin |

| PHP | Python | Python3 | Ruby | Rust | Scala | Swift |

↓WeChat reward↓ & ↓Alipay reward↓ → Reward List | 山青咏芝

No.	Swift && Title	C++	Python3	Kotlin	Difficulty
1326	Minimum Number of Taps to Open to Water a Garden	✓	✓	✓	Hard
1325	Delete Leaves With a Given Value	✓	✓	✓	Medium
1324	Print Words Vertically	✓	✓	✓	Medium
1323	Maximum 69 Number	✓	✓	✓	Easy
1322		✓	✓	✓	Easy
1321		✓	✓	✓	Medium
1320	Minimum Distance to Type a Word Using Two Fingers	✓	✓	✓	Hard
1319	Number of Operations to Make Network Connected	✓	✓	✓	Medium
1318	Minimum Flips to Make a OR b Equal to c	✓	✓	✓	Medium
1317	Convert Integer to the Sum of Two No-Zero Integers	✓	✓	✓	Easy
1316	Distinct Echo Substrings	✓	✓	✓	Hard
1315	Sum of Nodes with Even-Valued Grandparent	✓	✓	✓	Medium
1314	Matrix Block Sum	✓	✓	✓	Medium
1313	Decompress Run-Length Encoded List	✓	✓	✓	Easy
1312	Minimum Insertion Steps to Make a String Palindrome	✓	✓	✓	Hard
1311	Get Watched Videos by Your Friends	✓	✓	✓	Medium
1310	XOR Queries of a Subarray	✓	✓	✓	Medium
1309	Decrypt String from Alphabet to Integer Mapping	✓	✓	✓	Easy
1308		✓	✓	✓	Medium
1307	Verbal Arithmetic Puzzle	✓	✓	✓	Hard
1306	Jump Game III	✓	✓	✓	Medium
1305	All Elements in Two Binary Search Trees	✓	✓	✓	Medium
1304	Find N Unique Integers Sum up to Zero	✓	✓	✓	Easy
1303		✓	✓	✓	Easy
1302	Deepest Leaves Sum	✓	✓	✓	Medium
1301	Number of Paths with Max Score	✓	✓	✓	Hard
1300	Sum of Mutated Array Closest to Target	✓	✓	✓	Medium
1299	Replace Elements with Greatest Element on Right Side	✓	✓	✓	Easy
1298	Maximum Candies You Can Get from Boxes	✓	✓	✓	Hard
1297	Maximum Number of Occurrences of a Substring	✓	✓	✓	Medium
1296	Divide Array in Sets of K Consecutive Numbers	✓	✓	✓	Medium
1295	Find Numbers with Even Number of Digits	✓	✓	✓	Easy
1294		✓	✓	✓	Easy
1293	Shortest Path in a Grid with Obstacles Elimination	✓	✓	✓	Hard
1292	Maximum Side Length of a Square with Sum Less than or Equal to Threshold	✓	✓	✓	Medium
1291	Sequential Digits	✓	✓	✓	Medium
1290	Convert Binary Number in a Linked List to Integer	✓	✓	✓	Easy
1289	Minimum Falling Path Sum II	✓	✓	✓	Hard
1288	Remove Covered Intervals	✓	✓	✓	Medium
1287	Element Appearing More Than 25% In Sorted Array	✓	✓	✓	Easy
1286	Iterator for Combination	✓	✓	✓	Medium
1285		✓	✓	✓	Medium
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	✓	✓	✓	Hard
1283	Find the Smallest Divisor Given a Threshold	✓	✓	✓	Medium
1282	Group the People Given the Group Size They Belong To	✓	✓	✓	Medium
1281	Subtract the Product and Sum of Digits of an Integer	✓	✓	✓	Easy
1280		✓	✓	✓	Easy
1279		✓	✓	✓	Easy
1278	Palindrome Partitioning III	✓	✓	✓	Hard
1277	Count Square Submatrices with All Ones	✓	✓	✓	Medium
1276	Number of Burgers with No Waste of Ingredients	✓	✓	✓	Medium
1275	Find Winner on a Tic Tac Toe Game	✓	✓	✓	Easy
1274		✓	✓	✓	Hard
1273		✓	✓	✓	Medium
1272		✓	✓	✓	Medium
1271		✓	✓	✓	Easy
1270		✓	✓	✓	Medium
1269	Number of Ways to Stay in the Same Place After Some Steps	✓	✓	✓	Hard
1268	Search Suggestions System	✓	✓	✓	Medium
1267	Count Servers that Communicate	✓	✓	✓	Medium
1266	Minimum Time Visiting All Points	✓	✓	✓	Easy
1265		✓	✓	✓	Medium
1264		✓	✓	✓	Medium
1263		✓	✓	✓	Hard
1262		✓	✓	✓	Medium
1261		✓	✓	✓	Medium
1260		✓	✓	✓	Easy
1259		✓	✓	✓	Hard
1258		✓	✓	✓	Medium
1257		✓	✓	✓	Medium
1256		✓	✓	✓	Medium
1255	Maximum Score Words Formed by Letters	✓	✓	✓	Hard
1254	Number of Closed Islands	✓	✓	✓	Medium
1253	Reconstruct a 2-Row Binary Matrix	✓	✓	✓	Medium
1252	Cells with Odd Values in a Matrix	✓	✓	✓	Easy
1251		✓	✓	✓	Easy
1250	Check If It Is a Good Array	✓	✓	✓	Hard
1249	Minimum Remove to Make Valid Parentheses	✓	✓	✓	Medium
1248	Count Number of Nice Subarrays	✓	✓	✓	Medium
1247	Minimum Swaps to Make Strings Equal	✓	✓	✓	Medium
1246		✓	✓	✓	Hard
1245		✓	✓	✓	Medium
1244		✓	✓	✓	Medium
1243		✓	✓	✓	Easy
1242		✓	✓	✓	Medium
1241		✓	✓	✓	Easy
1240	Tiling a Rectangle with the Fewest Squares	✓	✓	✓	Hard
1239	Maximum Length of a Concatenated String with Unique Characters	✓	✓	✓	Medium
1238	Circular Permutation in Binary Representation	✓	✓	✓	Medium
1237	Find Positive Integer Solution for a Given Equation	✓	✓	✓	Easy
1236		✓	✓	✓	Medium
1235	Maximum Profit in Job Scheduling	✓	✓	✓	Hard
1234	Replace the Substring for Balanced String	✓	✓	✓	Medium
1233	Remove Sub-Folders from the Filesystem	✓	✓	✓	Medium
1232	Check If It Is a Straight Line	✓	✓	✓	Easy
1231		✓	✓	✓	Hard
1230		✓	✓	✓	Medium
1229		✓	✓	✓	Medium
1228		✓	✓	✓	Easy
1227	Airplane Seat Assignment Probability	✓	✓	✓	Medium
1226	The Dining Philosophers	✓	✓	✓	Medium
1225	Report Contiguous Dates	✓	✓	✓	Hard
1224	Maximum Equal Frequency	✓	✓	✓	Hard
1223	Dice Roll Simulation	✓	✓	✓	Medium
1222	Queens That Can Attack the King	✓	✓	✓	Medium
1221	Split a String in Balanced Strings	✓	✓	✓	Easy
1220	Count Vowels Permutation	✓	✓	✓	Hard
1219	Path with Maximum Gold	✓	✓	✓	Medium
1218	Longest Arithmetic Subsequence of Given Difference	✓	✓	✓	Medium
1217	Play with Chips	✓	✓	✓	Easy
1216	Valid Palindrome III	✓	✓	✓	Hard
1215	Stepping Numbers	✓	✓	✓	Medium
1214	Two Sum BSTs	✓	✓	✓	Medium
1213	Intersection of Three Sorted Arrays	✓	✓	✓	Easy
1212		✓	✓	✓	Medium
1211		✓	✓	✓	Easy
1210	Minimum Moves to Reach Target with Rotations	✓	✓	✓	Hard
1209	Remove All Adjacent Duplicates in String II	✓	✓	✓	Medium
1208	Get Equal Substrings Within Budget	✓	✓	✓	Medium
1207	Unique Number of Occurrences	✓	✓	✓	Easy
1206		✓	✓	✓	Hard
1205		✓	✓	✓	Medium
1204		✓	✓	✓	Medium
1203	Sort Items by Groups Respecting Dependencies	✓	✓	✓	Hard
1202	Smallest String With Swaps	✓	✓	✓	Medium
1201	Ugly Number III	✓	✓	✓	Medium
1200	Minimum Absolute Difference	✓	✓	✓	Easy
1199	Minimum Time To Build Blocks	✓	✓	✓	Hard
1198	Find Smallest Common Element in All Rows	✓	✓	✓	Medium
1197	Minimum Knight Moves	✓	✓	✓	Medium
1196	How Many Apples Can You Put into the Basket	✓	✓	✓	Easy
1195	Fizz Buzz Multithreaded	✓	✓	✓	Medium
1194		✓	✓	✓	Hard
1193		✓	✓	✓	Medium
1192	Critical Connections in a Network	✓	✓	✓	Hard
1191	K-Concatenation Maximum Sum	✓	✓	✓	Medium
1190	Reverse Substrings Between Each Pair of Parentheses	✓	✓	✓	Medium
1189	Maximum Number of Balloons	✓	✓	✓	Easy
1188		✓	✓	✓	Medium
1187	Make Array Strictly Increasing	✓	✓	✓	Hard
1186	Maximum Subarray Sum with One Deletion	✓	✓	✓	Medium
1185	Day of the Week	✓	✓	✓	Easy
1184	Distance Between Bus Stops	✓	✓	✓	Easy
1183	Maximum Number of Ones	✓	✓	✓	Hard
1182	Shortest Distance to Target Color	✓	✓	✓	Medium
1181	Before and After Puzzle	✓	✓	✓	Medium
1180	Count Substrings with Only One Distinct Letter	✓	✓	✓	Easy
1179	Reformat Department Table	✓	✓	✓	Easy
1178	Number of Valid Words for Each Puzzle	✓	✓	✓	Hard
1177	Can Make Palindrome from Substring	✓	✓	✓	Medium
1176	Diet Plan Performance	✓	✓	✓	Easy
1175	Prime Arrangements	✓	✓	✓	Easy
1174		✓	✓	✓	Medium
1173		✓	✓	✓	Easy
1172	Dinner Plate Stacks	✓	✓	✓	Hard
1171	Remove Zero Sum Consecutive Nodes from Linked List	✓	✓	✓	Medium
1170	Compare Strings by Frequency of the Smallest Character	✓	✓	✓	Easy
1169	Invalid Transactions	✓	✓	✓	Easy
1168	Optimize Water Distribution in a Village	✓	✓	✓	Hard
1167	Minimum Cost to Connect Sticks	✓	✓	✓	Medium
1166	Design File System	✓	✓	✓	Medium
1165	Single-Row Keyboard	✓	✓	✓	Easy
1164		✓	✓	✓	Medium
1163	Last Substring in Lexicographical Order	✓	✓	✓	Hard
1162	As Far from Land as Possible	✓	✓	✓	Medium
1161	Maximum Level Sum of a Binary Tree	✓	✓	✓	Medium
1160	Find Words That Can Be Formed by Characters	✓	✓	✓	Easy
1159		✓	✓	✓	Hard
1158		✓	✓	✓	Medium
1157	Online Majority Element In Subarray	✓	✓	✓	Hard
1156	Swap For Maximum Repeated Substring	✓	✓	✓	Medium
1155	Number of Dice Rolls With Target Sum	✓	✓	✓	Medium
1154	Ordinal Number Of Date	✓	✓	✓	Easy
1153	String Transforms Into Another String	✓	✓	✓	Hard
1152	Analyze User Website Visit Pattern	✓	✓	✓	Medium
1151	Minimum Swaps to Group All 1's Together	✓	✓	✓	Medium
1150	Check If a Number Is Majority Element in a Sorted Array	✓	✓	✓	Easy
1149		✓	✓	✓	Medium
1148		✓	✓	✓	Easy
1147	Longest Chunked Palindrome Decomposition	✓	✓	✓	Hard
1146	Snapshot Array	✓	✓	✓	Medium
1145	Binary Tree Coloring Game	✓	✓	✓	Hard
1144	Decrease Elements To Make Array Zigzag	✓	✓	✓	Easy
1143	Longest Common Subsequence	✓	✓	✓	Easy
1142		✓	✓	✓	Medium
1141		✓	✓	✓	Medium
1140	Stone Game II	✓	✓	✓	Medium
1139	Largest 1-Bordered Square	✓	✓	✓	Medium
1138	Alphabet Board Path	✓	✓	✓	Medium
1137	N-th Tribonacci Number	✓	✓	✓	Easy
1136	Parallel Courses	✓	✓	✓	Hard
1135	Connecting Cities With Minimum Cost	✓	✓	✓	Medium
1134	Armstrong Number	✓	✓	✓	Hard
1133	Largest Unique Number	✓	✓	✓	Easy
1132		✓	✓	✓	Easy
1131	Maximum of Absolute Value Expression	✓	✓	✓	Medium
1130	Minimum Cost Tree From Leaf Values	✓	✓	✓	Medium
1129	Shortest Path with Alternating Colors	✓	✓	✓	Medium
1128	Number of Equivalent Domino Pairs	✓	✓	✓	Easy
1127		✓	✓	✓	Hard
1126		✓	✓	✓	Medium
1125	Smallest Sufficient Team	✓	✓	✓	Hard
1124	Longest Well-Performing Interval	✓	✓	✓	Medium
1123	Lowest Common Ancestor of Deepest Leaves	✓	✓	✓	Medium
1122	Relative Sort Array	✓	✓	✓	Easy
1121	Divide Array Into Increasing Sequences	✓	✓	✓	Hard
1120	Maximum Average Subtree	✓	✓	✓	Medium
1119	Remove Vowels from a String	✓	✓	✓	Easy
1118	Number of Days in a Month	✓	✓	✓	Easy
1117	Building H2O	✓	✓	✓	Hard
1116	Print Zero Even Odd	✓	✓	✓	Medium
1115	Print FooBar Alternately	✓	✓	✓	Medium
1114	Print in Order	✓	✓	✓	Easy
1113		✓	✓	✓	Easy
1112		✓	✓	✓	Medium
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	✓	✓	✓	Medium
1110	Delete Nodes And Return Forest	✓	✓	✓	Medium
1109	Corporate Flight Bookings	✓	✓	✓	Medium
1108	Defanging an IP Address	✓	✓	✓	Easy
1107		✓	✓	✓	Medium
1106	Parsing A Boolean Expression	✓	✓	✓	Hard
1105	Filling Bookcase Shelves	✓	✓	✓	Medium
1104	Path In Zigzag Labelled Binary Tree	✓	✓	✓	Easy
1103	Distribute Candies to People	✓	✓	✓	Easy
1102	Path With Maximum Minimum Value	✓	✓	✓	Medium
1101	The Earliest Moment When Everyone Become Friends	✓	✓	✓	Medium
1100	Find K-Length Substrings With No Repeated Characters	✓	✓	✓	Medium
1099	Two Sum Less Than K	✓	✓	✓	Easy
1098		✓	✓	✓	Medium
1097		✓	✓	✓	Hard
1096	Brace Expansion II	✓	✓	✓	Hard
1095	Find in Mountain Array	✓	✓	✓	Hard
1094	Car Pooling	✓	✓	✓	Medium
1093	Statistics from a Large Sample	✓	✓	✓	Medium
1092	Shortest Common Supersequence	✓	✓	✓	Hard
1091	Shortest Path in Binary Matrix	✓	✓	✓	Medium
1090	Largest Values From Labels	✓	✓	✓	Medium
1089	Duplicate Zeros	✓	✓	✓	Easy
1088	Confusing Number II	✓	✓	✓	Hard
1087	Permutation of Letters	✓	✓	✓	Medium
1086	High Five	✓	✓	✓	Easy
1085	Sum of Digits in the Minimum Number	✓	✓	✓	Easy
1084		✓	✓	✓	Easy
1083		✓	✓	✓	Easy
1082		✓	✓	✓	Easy
1081	Smallest Subsequence of Distinct Characters	✓	✓	✓	Medium
1080	Insufficient Nodes in Root to Leaf Paths	✓	✓	✓	Medium
1079	Letter Tile Possibilities	✓	✓	✓	Medium
1078	Occurrences After Bigram	✓	✓	✓	Easy
1077		✓	✓	✓	Medium
1076		✓	✓	✓	Easy
1075		✓	✓	✓	Easy
1074	Number of Submatrices That Sum to Target	✓	✓	✓	Hard
1073	Adding Two Negabinary Numbers	✓	✓	✓	Medium
1072	Flip Columns For Maximum Number of Equal Rows	✓	✓	✓	Medium
1071	Greatest Common Divisor of Strings	✓	✓	✓	Easy
1070		✓	✓	✓	Medium
1069		✓	✓	✓	Easy
1068		✓	✓	✓	Easy
1067	Digit Count in Range	✓	✓	✓	Hard
1066	Campus Bikes II	✓	✓	✓	Medium
1065	Index Pairs of a String	✓	✓	✓	Easy
1064	Fixed Point	✓	✓	✓	Easy
1063		✓	✓	✓	Hard
1062		✓	✓	✓	Medium
1061		✓	✓	✓	Medium
1060		✓	✓	✓	Medium
1059		✓	✓	✓	Hard
1058		✓	✓	✓	Medium
1057		✓	✓	✓	Medium
1056		✓	✓	✓	Easy
1055		✓	✓	✓	Medium
1054	Distant Barcodes	✓	✓	✓	Medium
1053	Previous Permutation With One Swap	✓	✓	✓	Medium
1052	Grumpy Bookstore Owner	✓	✓	✓	Medium
1051	Height Checker	✓	✓	✓	Easy
1050	Actors and Directors Who Cooperated At Least Three Times	✓	✓	✓	Easy
1049	Last Stone Weight II	✓	✓	✓	Medium
1048	Longest String Chain	✓	✓	✓	Medium
1047	Remove All Adjacent Duplicates In String	✓	✓	✓	Easy
1046	Last Stone Weight	✓	✓	✓	Easy
1045	Customers Who Bought All Products	✓	✓	✓	Medium
1043	Partition Array for Maximum Sum	✓	✓	✓	Medium
1042	Flower Planting With No Adjacent	✓	✓	✓	Easy
1041	Robot Bounded In Circle	✓	✓	✓	Easy
1040	Moving Stones Until Consecutive II	✓	✓	✓	Medium
1039	Minimum Score Triangulation of Polygon	✓	✓	✓	Medium
1038	Binary Search Tree to Greater Sum Tree	✓	✓	✓	Medium
1037	Valid Boomerang	✓	✓	✓	Easy
1036	Escape a Large Maze	✓	✓	✓	Hard
1035	Uncrossed Lines	✓	✓	✓	Medium
1034	Coloring A Border	✓	✓	✓	Medium
1033	Moving Stones Until Consecutive	✓	✓	✓	Easy
1032	Stream of Characters	✓	✓	✓	Hard
1031	Maximum Sum of Two Non-Overlapping Subarrays	✓	✓	✓	Medium
1030	Matrix Cells in Distance Order	✓	✓	✓	Easy
1029	Two City Scheduling	✓	✓	✓	Easy
1028	Recover a Tree From Preorder Traversal	✓	✓	✓	Hard
1027	Longest Arithmetic Sequence	✓	✓	✓	Medium
1026	Maximum Difference Between Node and Ancestor	✓	✓	✓	Medium
1025	Divisor Game	✓	✓	✓	Easy
1024	Video Stitching	✓	✓	✓	Medium
1023	Camelcase Matching	✓	✓	✓	Medium
1022	Sum of Root To Leaf Binary Numbers	✓	✓	✓	Easy
1021	Remove Outermost Parentheses	✓	✓	✓	Easy
1020	Number of Enclaves	✓	✓	✓	Medium
1019	Next Greater Node In Linked List	✓	✓	✓	Medium
1018	Binary Prefix Divisible By 5	✓	✓	✓	Easy
1017	Convert to Base -2	✓	✓	✓	Medium
1016	Binary String With Substrings Representing 1 To N	✓	✓	✓	Medium
1015	Smallest Integer Divisible by K	✓	✓	✓	Medium
1014	Best Sightseeing Pair	✓	✓	✓	Medium
1013	Partition Array Into Three Parts With Equal Sum	✓	✓	✓	Easy
1012	Numbers With 1 Repeated Digit	✓	✓	✓	Hard
1011	Capacity To Ship Packages Within D Days	✓	✓	✓	Medium
1010	Pairs of Songs With Total Durations Divisible by 60	✓	✓	✓	Easy
1009	Complement of Base 10 Integer	✓	✓	✓	Easy
1008	Construct Binary Search Tree from Preorder Traversal	✓	✓	✓	Medium
1007	Minimum Domino Rotations For Equal Row	✓	✓	✓	Medium
1006	Clumsy Factorial	✓	✓	✓	Medium
1005	Maximize Sum Of Array After K Negations	✓	✓	✓	Easy
1004	Max Consecutive Ones III	✓	✓	✓	Medium
1003	Check If Word Is Valid After Substitutions	✓	✓	✓	Medium
1002	Find Common Characters	✓	✓	✓	Easy
1001	Grid Illumination	✓	✓	✓	Hard
1000	Minimum Cost to Merge Stones	✓	✓	✓	Hard
999	Available Captures for Rook	✓	✓	✓	Easy
998	Maximum Binary Tree II	✓	✓	✓	Medium
997	Find the Town Judge	✓	✓	✓	Easy
996	Number of Squareful Arrays	✓	✓	✓	Hard
995	Minimum Number of K Consecutive Bit Flips	✓	✓	✓	Hard
994	Rotting Oranges	✓	✓	✓	Easy
993	Cousins in Binary Tree	✓	✓	✓	Easy
992	Subarrays with K Different Integers	✓	✓	✓	Hard
991	Broken Calculator	✓	✓	✓	Medium
990	Satisfiability of Equality Equations	✓	✓	✓	Medium
989	Add to Array-Form of Integer	✓	✓	✓	Easy
988	Smallest String Starting From Leaf	✓	✓	✓	Medium
987	Vertical Order Traversal of a Binary Tree	✓	✓	✓	Medium
986	Interval List Intersections	✓	✓	✓	Medium
985	Sum of Even Numbers After Queries	✓	✓	✓	Easy
984	String Without AAA or BBB	✓	✓	✓	Medium
983	Minimum Cost For Tickets	✓	✓	✓	Medium
982	Triples with Bitwise AND Equal To Zero	✓	✓	✓	Hard
981	Time Based Key-Value Store	✓	✓	✓	Medium
980	Unique Paths III	✓	✓	✓	Hard
979	Distribute Coins in Binary Tree	✓	✓	✓	Medium
978	Longest Turbulent Subarray	✓	✓	✓	Medium
977	Squares of a Sorted Array	✓	✓	✓	Easy
976	Largest Perimeter Triangle	✓	✓	✓	Easy
975	Odd Even Jump	✓	✓	✓	Hard
974	Subarray Sums Divisible by K	✓	✓	✓	Medium
973	K Closest Points to Origin	✓	✓	✓	Medium
972	Equal Rational Numbers	✓	✓	✓	Hard
971	Flip Binary Tree To Match Preorder Traversal	✓	✓	✓	Medium
970	Powerful Integers	✓	✓	✓	Easy
969	Pancake Sorting	✓	✓	✓	Medium
968	Binary Tree Cameras	✓	✓	✓	Hard
967	Numbers With Same Consecutive Differences	✓	✓	✓	Medium
966	Vowel Spellchecker	✓	✓	✓	Medium
965	Univalued Binary Tree	✓	✓	✓	Easy
964	Least Operators to Express Number	✓	✓	✓	Hard
963	Minimum Area Rectangle II	✓	✓	✓	Medium
962	Maximum Width Ramp	✓	✓	✓	Medium
961	N-Repeated Element in Size 2N Array	✓	✓	✓	Easy
960	Delete Columns to Make Sorted III	✓	✓	✓	Hard
959	Regions Cut By Slashes	✓	✓	✓	Medium
958	Check Completeness of a Binary Tree	✓	✓	✓	Medium
957	Prison Cells After N Days	✓	✓	✓	Medium
956	Tallest Billboard	✓	✓	✓	Hard
955	Delete Columns to Make Sorted II	✓	✓	✓	Medium
954	Array of Doubled Pairs	✓	✓	✓	Medium
953	Verifying an Alien Dictionary	✓	✓	✓	Easy
952	Largest Component Size by Common Factor	✓	✓	✓	Hard
951	Flip Equivalent Binary Trees	✓	✓	✓	Medium
950	Reveal Cards In Increasing Order	✓	✓	✓	Medium
949	Largest Time for Given Digits	✓	✓	✓	Easy
948	Bag of Tokens	✓	✓	✓	Medium
947	Most Stones Removed with Same Row or Column	✓	✓	✓	Medium
946	Validate Stack Sequences	✓	✓	✓	Medium
945	Minimum Increment to Make Array Unique	✓	✓	✓	Medium
944	Delete Columns to Make Sorted	✓	✓	✓	Easy
943	Find the Shortest Superstring	✓	✓	✓	Hard
942	DI String Match	✓	✓	✓	Easy
941	Valid Mountain Array	✓	✓	✓	Easy
940	Distinct Subsequences II	✓	✓	✓	Hard
939	Minimum Area Rectangle	✓	✓	✓	Medium
938	Range Sum of BST	✓	✓	✓	Medium
937	Reorder Log Files	✓	✓	✓	Easy
936	Stamping The Sequence	✓	✓	✓	Hard
935	Knight Dialer	✓	✓	✓	Medium
934	Shortest Bridge	✓	✓	✓	Medium
933	Number of Recent Calls	✓	✓	✓	Easy
932	Beautiful Array	✓	✓	✓	Medium
931	Minimum Falling Path Sum	✓	✓	✓	Medium
930	Binary Subarrays With Sum	✓	✓	✓	Medium
929	Unique Email Addresses	✓	✓	✓	Easy
928	Minimize Malware Spread II	✓	✓	✓	Hard
927	Three Equal Parts	✓	✓	✓	Hard
926	Flip String to Monotone Increasing	✓	✓	✓	Medium
925	Long Pressed Name	✓	✓	✓	Easy
924	Minimize Malware Spread	✓	✓	✓	Hard
923	3Sum With Multiplicity	✓	✓	✓	Medium
922	Sort Array By Parity II	✓	✓	✓	Easy
921	Minimum Add to Make Parentheses Valid	✓	✓	✓	Medium
920	Number of Music Playlists	✓	✓	✓	Hard
919	Complete Binary Tree Inserter	✓	✓	✓	Medium
918	Maximum Sum Circular Subarray	✓	✓	✓	Medium
917	Reverse Only Letters	✓	✓	✓	Easy
916	Word Subsets	✓	✓	✓	Medium
915	Partition Array into Disjoint Intervals	✓	✓	✓	Medium
914	X of a Kind in a Deck of Cards	✓	✓	✓	Easy
913	Cat and Mouse	✓	✓	✓	Hard
912	Sort an Array	✓	✓	✓	Medium
911	Online Election	✓	✓	✓	Medium
910	Smallest Range II	✓	✓	✓	Medium
909	Snakes and Ladders	✓	✓	✓	Medium
908	Smallest Range I	✓	✓	✓	Easy
907	Sum of Subarray Minimums	✓	✓	✓	Medium
906	Super Palindromes	✓	✓	✓	Hard
905	Sort Array By Parity	✓	✓	✓	Easy
904	Fruit Into Baskets	✓	✓	✓	Medium
903	Valid Permutations for DI Sequence	✓	✓	✓	Hard
902	Numbers At Most N Given Digit Set	✓	✓	✓	Hard
901	Online Stock Span	✓	✓	✓	Medium
900	RLE Iterator	✓	✓	✓	Medium
899	Orderly Queue	✓	✓	✓	Hard
898	Bitwise ORs of Subarrays	✓	✓	✓	Medium
897	Increasing Order Search Tree	✓	✓	✓	Easy
896	Monotonic Array	✓	✓	✓	Easy
895	Maximum Frequency Stack	✓	✓	✓	Hard
894	All Possible Full Binary Trees	✓	✓	✓	Medium
893	Groups of Special-Equivalent Strings	✓	✓	✓	Easy
892	Surface Area of 3D Shapes	✓	✓	✓	Easy
891	Sum of Subsequence Widths	✓	✓	✓	Hard
890	Find and Replace Pattern	✓	✓	✓	Medium
889	Construct Binary Tree from Preorder and Postorder Traversal	✓	✓	✓	Medium
888	Fair Candy Swap	✓	✓	✓	Easy
887	Super Egg Drop	✓	✓	✓	Hard
886	Possible Bipartition	✓	✓	✓	Medium
885	Spiral Matrix III	✓	✓	✓	Medium
884	Uncommon Words from Two Sentences	✓	✓	✓	Easy
883	Projection Area of 3D Shapes	✓	✓	✓	Easy
882	Reachable Nodes In Subdivided Graph	✓	✓	✓	Hard
881	Boats to Save People	✓	✓	✓	Medium
880	Decoded String at Index	✓	✓	✓	Medium
879	Profitable Schemes	✓	✓	✓	Hard
878	Nth Magical Number	✓	✓	✓	Hard
877	Stone Game	✓	✓	✓	Medium
876	Middle of the Linked List	✓	✓	✓	Easy
875	Koko Eating Bananas	✓	✓	✓	Medium
874	Walking Robot Simulation	✓	✓	✓	Easy
873	Length of Longest Fibonacci Subsequence	✓	✓	✓	Medium
872	Leaf-Similar Trees	✓	✓	✓	Easy
871	Minimum Number of Refueling Stops	✓	✓	✓	Hard
870	Advantage Shuffle	✓	✓	✓	Medium
869	Reordered Power of 2	✓	✓	✓	Medium
868	Binary Gap	✓	✓	✓	Easy
867	Transpose Matrix	✓	✓	✓	Easy
866	Prime Palindrome	✓	✓	✓	Medium
865	Smallest Subtree with all the Deepest Nodes	✓	✓	✓	Medium
864	Shortest Path to Get All Keys	✓	✓	✓	Hard
863	All Nodes Distance K in Binary Tree	✓	✓	✓	Medium
862	Shortest Subarray with Sum at Least K	✓	✓	✓	Hard
861	Score After Flipping Matrix	✓	✓	✓	Medium
860	Lemonade Change	✓	✓	✓	Easy
859	Buddy Strings	✓	✓	✓	Easy
858	Mirror Reflection	✓	✓	✓	Medium
857	Minimum Cost to Hire K Workers	✓	✓	✓	Hard
856	Score of Parentheses	✓	✓	✓	Medium
855	Exam Room	✓	✓	✓	Medium
854	K-Similar Strings	✓	✓	✓	Hard
853	Car Fleet	✓	✓	✓	Medium
852	Peak Index in a Mountain Array	✓	✓	✓	Easy
851	Loud and Rich	✓	✓	✓	Medium
850	Rectangle Area II	✓	✓	✓	Hard
849	Maximize Distance to Closest Person	✓	✓	✓	Easy
848	Shifting Letters	✓	✓	✓	Medium
847	Shortest Path Visiting All Nodes	✓	✓	✓	Hard
846	Hand of Straights	✓	✓	✓	Medium
845	Longest Mountain in Array	✓	✓	✓	Medium
844	Backspace String Compare	✓	✓	✓	Easy
843	Guess the Word	✓	✓	✓	Hard
842	Split Array into Fibonacci Sequence	✓	✓	✓	Medium
841	Keys and Rooms	✓	✓	✓	Medium
840	Magic Squares In Grid	✓	✓	✓	Easy
839	Similar String Groups	✓	✓	✓	Hard
838	Push Dominoes	✓	✓	✓	Medium
837	New 21 Game	✓	✓	✓	Medium
836	Rectangle Overlap	✓	✓	✓	Easy
835	Image Overlap	✓	✓	✓	Medium
834	Sum of Distances in Tree	✓	✓	✓	Hard
833	Find And Replace in String	✓	✓	✓	Medium
832	Flipping an Image	✓	✓	✓	Easy
831	Masking Personal Information	✓	✓	✓	Medium
830	Positions of Large Groups	✓	✓	✓	Easy
829	Consecutive Numbers Sum	✓	✓	✓	Hard
828	Unique Letter String	✓	✓	✓	Hard
827	Making A Large Island	✓	✓	✓	Hard
826	Most Profit Assigning Work	✓	✓	✓	Medium
825	Friends Of Appropriate Ages	✓	✓	✓	Medium
824	Goat Latin	✓	✓	✓	Easy
823	Binary Trees With Factors	✓	✓	✓	Medium
822	Card Flipping Game	✓	✓	✓	Medium
821	Shortest Distance to a Character	✓	✓	✓	Easy
820	Short Encoding of Words	✓	✓	✓	Medium
819	Most Common Word	✓	✓	✓	Easy
818	Race Car	✓	✓	✓	Hard
817	Linked List Components	✓	✓	✓	Medium
816	Ambiguous Coordinates	✓	✓	✓	Medium
815	Bus Routes	✓	✓	✓	Hard
814	Binary Tree Pruning	✓	✓	✓	Medium
813	Largest Sum of Averages	✓	✓	✓	Medium
812	Largest Triangle Area	✓	✓	✓	Easy
811	Subdomain Visit Count	✓	✓	✓	Easy
810	Chalkboard XOR Game	✓	✓	✓	Hard
809	Expressive Words	✓	✓	✓	Medium
808	Soup Servings	✓	✓	✓	Medium
807	Max Increase to Keep City Skyline	✓	✓	✓	Medium
806	Number of Lines To Write String	✓	✓	✓	Easy
805	Split Array With Same Average	✓	✓	✓	Hard
804	Unique Morse Code Words	✓	✓	✓	Easy
803	Bricks Falling When Hit	✓	✓	✓	Hard
802	Find Eventual Safe States	✓	✓	✓	Medium
801	Minimum Swaps To Make Sequences Increasing	✓	✓	✓	Medium
800		✓	✓	✓	Easy
799	Champagne Tower	✓	✓	✓	Medium
798	Smallest Rotation with Highest Score	✓	✓	✓	Hard
797	All Paths From Source to Target	✓	✓	✓	Medium
796	Rotate String	✓	✓	✓	Easy
795	Number of Subarrays with Bounded Maximum	✓	✓	✓	Medium
794	Valid Tic-Tac-Toe State	✓	✓	✓	Medium
793	Preimage Size of Factorial Zeroes Function	✓	✓	✓	Hard
792	Number of Matching Subsequences	✓	✓	✓	Medium
791	Custom Sort String	✓	✓	✓	Medium
790	Domino and Tromino Tiling	✓	✓	✓	Medium
789	Escape The Ghosts	✓	✓	✓	Medium
788	Rotated Digits	✓	✓	✓	Easy
787	Cheapest Flights Within K Stops	✓	✓	✓	Medium
786	K-th Smallest Prime Fraction	✓	✓	✓	Hard
785	Is Graph Bipartite?	✓	✓	✓	Medium
784	Letter Case Permutation	✓	✓	✓	Easy
783	Minimum Distance Between BST Nodes	✓	✓	✓	Easy
782	Transform to Chessboard	✓	✓	✓	Hard
781	Rabbits in Forest	✓	✓	✓	Medium
780	Reaching Points	✓	✓	✓	Hard
779	K-th Symbol in Grammar	✓	✓	✓	Medium
778	Swim in Rising Water	✓	✓	✓	Hard
777	Swap Adjacent in LR String	✓	✓	✓	Medium
776		✓	✓	✓	Medium
775	Global and Local Inversions	✓	✓	✓	Medium
774		✓	✓	✓	Hard
773	Sliding Puzzle	✓	✓	✓	Hard
772		✓	✓	✓	Hard
771	Jewels and Stones	✓	✓	✓	Easy
770	Basic Calculator IV	✓	✓	✓	Hard
769	Max Chunks To Make Sorted	✓	✓	✓	Medium
768	Max Chunks To Make Sorted II	✓	✓	✓	Hard
767	Reorganize String	✓	✓	✓	Medium
766	Toeplitz Matrix	✓	✓	✓	Easy
765	Couples Holding Hands	✓	✓	✓	Hard
764	Largest Plus Sign	✓	✓	✓	Medium
763	Partition Labels	✓	✓	✓	Medium
762	Prime Number of Set Bits in Binary Representation	✓	✓	✓	Easy
761	Special Binary String	✓	✓	✓	Hard
760		✓	✓	✓	Easy
759		✓	✓	✓	Hard
758		✓	✓	✓	Easy
757	Set Intersection Size At Least Two	✓	✓	✓	Hard
756	Pyramid Transition Matrix	✓	✓	✓	Medium
755		✓	✓	✓	Medium
754	Reach a Number	✓	✓	✓	Easy
753	Cracking the Safe	✓	✓	✓	Hard
752	Open the Lock	✓	✓	✓	Medium
751		✓	✓	✓	Easy
750		✓	✓	✓	Medium
749	Contain Virus	✓	✓	✓	Hard
748	Shortest Completing Word	✓	✓	✓	Easy
747	Largest Number At Least Twice of Others	✓	✓	✓	Easy
746	Min Cost Climbing Stairs	✓	✓	✓	Easy
745	Prefix and Suffix Search	✓	✓	✓	Hard
744	Find Smallest Letter Greater Than Target	✓	✓	✓	Easy
743	Network Delay Time	✓	✓	✓	Medium
742		✓	✓	✓	Medium
741	Cherry Pickup	✓	✓	✓	Hard
740	Delete and Earn	✓	✓	✓	Medium
739	Daily Temperatures	✓	✓	✓	Medium
738	Monotone Increasing Digits	✓	✓	✓	Medium
737		✓	✓	✓	Medium
736	Parse Lisp Expression	✓	✓	✓	Medium
735	Asteroid Collision	✓	✓	✓	Medium
734		✓	✓	✓	Easy
733	Flood Fill	✓	✓	✓	Easy
732	My Calendar III	✓	✓	✓	Hard
731	My Calendar II	✓	✓	✓	Medium
730	Count Different Palindromic Subsequences	✓	✓	✓	Hard
729	My Calendar I	✓	✓	✓	Medium
728	Self Dividing Numbers	✓	✓	✓	Easy
727		✓	✓	✓	Hard
726	Number of Atoms	✓	✓	✓	Hard
725	Split Linked List in Parts	✓	✓	✓	Medium
724	Find Pivot Index	✓	✓	✓	Easy
723		✓	✓	✓	Medium
722	Remove Comments	✓	✓	✓	Medium
721	Accounts Merge	✓	✓	✓	Medium
720	Longest Word in Dictionary	✓	✓	✓	Easy
719	Find K-th Smallest Pair Distance	✓	✓	✓	Hard
718	Maximum Length of Repeated Subarray	✓	✓	✓	Medium
717		✓	✓	✓	Easy
716		✓	✓	✓	Easy
715	Range Module	✓	✓	✓	Hard
714	Best Time to Buy and Sell Stock with Transaction Fee	✓	✓	✓	Medium
713	Subarray Product Less Than K	✓	✓	✓	Medium
712	Minimum ASCII Delete Sum for Two Strings	✓	✓	✓	Medium
711		✓	✓	✓	Hard
710	Random Pick with Blacklist	✓	✓	✓	Hard
709	To Lower Case	✓	✓	✓	Easy
708		✓	✓	✓	Medium
707	Design Linked List	✓	✓	✓	Easy
706	Design HashMap	✓	✓	✓	Easy
705	Design HashSet	✓	✓	✓	Easy
704	Binary Search	✓	✓	✓	Easy
703	Kth Largest Element in a Stream	✓	✓	✓	Easy
702		✓	✓	✓	Medium
701	Insert into a Binary Search Tree	✓	✓	✓	Medium
700	Search in a Binary Search Tree	✓	✓	✓	Easy
699	Falling Squares	✓	✓	✓	Hard
698	Partition to K Equal Sum Subsets	✓	✓	✓	Medium
697	Degree of an Array	✓	✓	✓	Easy
696	Count Binary Substrings	✓	✓	✓	Easy
695	Max Area of Island	✓	✓	✓	Medium
694		✓	✓	✓	Medium
693	Binary Number with Alternating Bits	✓	✓	✓	Easy
692	Top K Frequent Words	✓	✓	✓	Medium
691	Stickers to Spell Word	✓	✓	✓	Hard
690	Employee Importance	✓	✓	✓	Easy
689	Maximum Sum of 3 Non-Overlapping Subarrays	✓	✓	✓	Hard
688	Knight Probability in Chessboard	✓	✓	✓	Medium
687	Longest Univalue Path	✓	✓	✓	Easy
686	Repeated String Match	✓	✓	✓	Easy
685	Redundant Connection II	✓	✓	✓	Hard
684	Redundant Connection	✓	✓	✓	Medium
683		✓	✓	✓	Hard
682	Baseball Game	✓	✓	✓	Easy
681		✓	✓	✓	Medium
680	Valid Palindrome II	✓	✓	✓	Easy
679	24 Game	✓	✓	✓	Medium
678	Valid Parenthesis String	✓	✓	✓	Medium
677	Map Sum Pairs	✓	✓	✓	Medium
676	Implement Magic Dictionary	✓	✓	✓	Medium
675	Cut Off Trees for Golf Event	✓	✓	✓	Hard
674	Longest Continuous Increasing Subsequence	✓	✓	✓	Easy
673	Number of Longest Increasing Subsequence	✓	✓	✓	Medium
672	Bulb Switcher II	✓	✓	✓	Medium
671	Second Minimum Node In a Binary Tree	✓	✓	✓	Easy
670	Maximum Swap	✓	✓	✓	Medium
669	Trim a Binary Search Tree	✓	✓	✓	Easy
668	Kth Smallest Number in Multiplication Table	✓	✓	✓	Hard
667	Beautiful Arrangement II	✓	✓	✓	Medium
666		✓	✓	✓	Medium
665	Non-decreasing Array	✓	✓	✓	Medium
664	Strange Printer	✓	✓	✓	Medium
663		✓	✓	✓	Medium
662	Maximum Width of Binary Tree	✓	✓	✓	Medium
661	Image Smoother	✓	✓	✓	Easy
660		✓	✓	✓	Hard
659	Split Array into Consecutive Subsequences	✓	✓	✓	Medium
658	Find K Closest Elements	✓	✓	✓	Medium
657	Robot Return to Origin	✓	✓	✓	Easy
656		✓	✓	✓	Hard
655	Print Binary Tree	✓	✓	✓	Medium
654	Maximum Binary Tree	✓	✓	✓	Medium
653	Two Sum IV - Input is a BST	✓	✓	✓	Easy
652	Find Duplicate Subtrees	✓	✓	✓	Medium
651		✓	✓	✓	Medium
650	2 Keys Keyboard	✓	✓	✓	Medium
649	Dota2 Senate	✓	✓	✓	Medium
648	Replace Words	✓	✓	✓	Medium
647	Palindromic Substrings	✓	✓	✓	Medium
646	Maximum Length of Pair Chain	✓	✓	✓	Medium
645	Set Mismatch	✓	✓	✓	Easy
644		✓	✓	✓	Hard
643	Maximum Average Subarray I	✓	✓	✓	Easy
642		✓	✓	✓	Hard
641	Design Circular Deque	✓	✓	✓	Medium
640	Solve the Equation	✓	✓	✓	Medium
639	Decode Ways II	✓	✓	✓	Hard
638	Shopping Offers	✓	✓	✓	Medium
637	Average of Levels in Binary Tree	✓	✓	✓	Easy
636	Exclusive Time of Functions	✓	✓	✓	Medium
635		✓	✓	✓	Medium
634		✓	✓	✓	Medium
633	Sum of Square Numbers	✓	✓	✓	Easy
632	Smallest Range	✓	✓	✓	Hard
631		✓	✓	✓	Hard
630	Course Schedule III	✓	✓	✓	Hard
629	K Inverse Pairs Array	✓	✓	✓	Hard
628	Maximum Product of Three Numbers	✓	✓	✓	Easy
627	Swap Salary	✓	✓	✓	Easy
626	Exchange Seats	✓	✓	✓	Medium
625		✓	✓	✓	Medium
624		✓	✓	✓	Easy
623	Add One Row to Tree	✓	✓	✓	Medium
622	Design Circular Queue	✓	✓	✓	Medium
621	Task Scheduler	✓	✓	✓	Medium
620	Not Boring Movies	✓	✓	✓	Easy
619		✓	✓	✓	Easy
618		✓	✓	✓	Hard
617	Merge Two Binary Trees	✓	✓	✓	Easy
616		✓	✓	✓	Medium
615		✓	✓	✓	Hard
614		✓	✓	✓	Medium
613		✓	✓	✓	Easy
612		✓	✓	✓	Medium
611	Valid Triangle Number	✓	✓	✓	Medium
610		✓	✓	✓	Easy
609	Find Duplicate File in System	✓	✓	✓	Medium
608		✓	✓	✓	Medium
607		✓	✓	✓	Easy
606	Construct String from Binary Tree	✓	✓	✓	Easy
605	Can Place Flowers	✓	✓	✓	Easy
604		✓	✓	✓	Easy
603		✓	✓	✓	Easy
602		✓	✓	✓	Medium
601	Human Traffic of Stadium	✓	✓	✓	Hard
600	Non-negative Integers without Consecutive Ones	✓	✓	✓	Hard
599	Minimum Index Sum of Two Lists	✓	✓	✓	Easy
598	Range Addition II	✓	✓	✓	Easy
597		✓	✓	✓	Easy
596	Classes More Than 5 Students	✓	✓	✓	Easy
595	Big Countries	✓	✓	✓	Easy
594	Longest Harmonious Subsequence	✓	✓	✓	Easy
593	Valid Square	✓	✓	✓	Medium
592	Fraction Addition and Subtraction	✓	✓	✓	Medium
591	Tag Validator	✓	✓	✓	Hard
590		✓	✓	✓	Easy
589		✓	✓	✓	Easy
588		✓	✓	✓	Hard
587	Erect the Fence	✓	✓	✓	Hard
586		✓	✓	✓	Easy
585		✓	✓	✓	Medium
584		✓	✓	✓	Easy
583	Delete Operation for Two Strings	✓	✓	✓	Medium
582		✓	✓	✓	Medium
581	Shortest Unsorted Continuous Subarray	✓	✓	✓	Easy
580		✓	✓	✓	Medium
579		✓	✓	✓	Hard
578		✓	✓	✓	Medium
577	Employee Bonus	✓	✓	✓	Easy
576	Out of Boundary Paths	✓	✓	✓	Medium
575	Distribute Candies	✓	✓	✓	Easy
574		✓	✓	✓	Medium
573		✓	✓	✓	Medium
572	Subtree of Another Tree	✓	✓	✓	Easy
571		✓	✓	✓	Hard
570		✓	✓	✓	Medium
569		✓	✓	✓	Hard
568		✓	✓	✓	Hard
567	Permutation in String	✓	✓	✓	Medium
566	Reshape the Matrix	✓	✓	✓	Easy
565	Array Nesting	✓	✓	✓	Medium
564	Find the Closest Palindrome	✓	✓	✓	Hard
563	Binary Tree Tilt	✓	✓	✓	Easy
562		✓	✓	✓	Medium
561	Array Partition I	✓	✓	✓	Easy
560	Subarray Sum Equals K	✓	✓	✓	Medium
559		✓	✓	✓	Easy
558		✓	✓	✓	Easy
557	Reverse Words in a String III	✓	✓	✓	Easy
556	Next Greater Element III	✓	✓	✓	Medium
555		✓	✓	✓	Medium
554	Brick Wall	✓	✓	✓	Medium
553	Optimal Division	✓	✓	✓	Medium
552	Student Attendance Record II	✓	✓	✓	Hard
551	Student Attendance Record I	✓	✓	✓	Easy
550		✓	✓	✓	Medium
549		✓	✓	✓	Medium
548		✓	✓	✓	Medium
547	Friend Circles	✓	✓	✓	Medium
546	Remove Boxes	✓	✓	✓	Hard
545		✓	✓	✓	Medium
544		✓	✓	✓	Medium
543	Diameter of Binary Tree	✓	✓	✓	Easy
542	01 Matrix	✓	✓	✓	Medium
541	Reverse String II	✓	✓	✓	Easy
540	Single Element in a Sorted Array	✓	✓	✓	Medium
539	Minimum Time Difference	✓	✓	✓	Medium
538	Convert BST to Greater Tree	✓	✓	✓	Easy
537	Complex Number Multiplication	✓	✓	✓	Medium
536		✓	✓	✓	Medium
535		✓	✓	✓	Medium
534		✓	✓	✓	Medium
533		✓	✓	✓	Medium
532	K-diff Pairs in an Array	✓	✓	✓	Easy
531		✓	✓	✓	Medium
530	Minimum Absolute Difference in BST	✓	✓	✓	Easy
529	Minesweeper	✓	✓	✓	Medium
528	Random Pick with Weight	✓	✓	✓	Medium
527		✓	✓	✓	Hard
526	Beautiful Arrangement	✓	✓	✓	Medium
525	Contiguous Array	✓	✓	✓	Medium
524	Longest Word in Dictionary through Deleting	✓	✓	✓	Medium
523	Continuous Subarray Sum	✓	✓	✓	Medium
522	Longest Uncommon Subsequence II	✓	✓	✓	Medium
521	Longest Uncommon Subsequence I	✓	✓	✓	Easy
520	Detect Capital	✓	✓	✓	Easy
519	Random Flip Matrix	✓	✓	✓	Medium
518	Coin Change 2	✓	✓	✓	Medium
517	Super Washing Machines	✓	✓	✓	Hard
516	Longest Palindromic	✓	✓	✓	Medium
515	Find Largest Value in Each Tree Row	✓	✓	✓	Medium
514	Freedom Trail	✓	✓	✓	Hard
513	Find Bottom Left Tree Value	✓	✓	✓	Medium
512		✓	✓	✓	Medium
511		✓	✓	✓	Medium
510		✓	✓	✓	Medium
509	Fibonacci Number	✓	✓	✓	Easy
508	Most Frequent Subtree Sum	✓	✓	✓	Medium
507	Perfect Number	✓	✓	✓	Easy
506	Relative Ranks	✓	✓	✓	Easy
505		✓	✓	✓	Medium
504	Base 7	✓	✓	✓	Easy
503	Next Greater Element II	✓	✓	✓	Medium
502	Initial Public Offerings	✓	✓	✓	Hard
501	Find Mode in Binary Search Tree	✓	✓	✓	Easy
500	Keyboard Row	✓	✓	✓	Easy
499		✓	✓	✓	Hard
498	Diagonal Traverse	✓	✓	✓	Medium
497	[Random Point in Non	✓	✓	✓	Medium
496	Next Greater Element I	✓	✓	✓	Easy
495	Teemo Attacking	✓	✓	✓	Medium
494	Target Sum	✓	✓	✓	Medium
493	Reverse Pairs	✓	✓	✓	Hard
492	Construct the Rectangle	✓	✓	✓	Easy
491	Increasing Subsequences	✓	✓	✓	Medium
490		✓	✓	✓	Medium
489		✓	✓	✓	Hard
488	Zuma Game	✓	✓	✓	Hard
487		✓	✓	✓	Medium
486	Predict the Winner	✓	✓	✓	Medium
485	Max Consecutive Ones	✓	✓	✓	Easy
484		✓	✓	✓	Medium
483	Smallest Good Base	✓	✓	✓	Hard
482	License Key Formatting	✓	✓	✓	Easy
481	Magical String	✓	✓	✓	Medium
480	Sliding Window Median	✓	✓	✓	Hard
479	Largest Palindrome Product	✓	✓	✓	Hard
478	Generate Random Point in a Circle	✓	✓	✓	Medium
477	Total Hamming Distance	✓	✓	✓	Medium
476	Number Complement	✓	✓	✓	Easy
475	Heaters	✓	✓	✓	Easy
474	Ones and Zeroes	✓	✓	✓	Medium
473	Matchsticks to Square	✓	✓	✓	Medium
472	Concatenated Words	✓	✓	✓	Hard
471		✓	✓	✓	Hard
470	Implement Rand10() Using Rand7()	✓	✓	✓	Medium
469		✓	✓	✓	Medium
468	Validate IP Address	✓	✓	✓	Medium
467	Unique Substrings in Wraparound String	✓	✓	✓	Medium
466	Count The Repetitions	✓	✓	✓	Hard
465		✓	✓	✓	Hard
464	Can I Win	✓	✓	✓	Medium
463	Island Perimeter	✓	✓	✓	Easy
462	Minimum Moves to Equal Array Elements II	✓	✓	✓	Medium
461	Hamming Distance	✓	✓	✓	Easy
460	LFU Cache	✓	✓	✓	Hard
459	Repeated Substring Pattern	✓	✓	✓	Easy
458	Poor Pigs	✓	✓	✓	Hard
457	Circular Array Loop	✓	✓	✓	Medium
456	132 Pattern	✓	✓	✓	Medium
455	Assign Cookies	✓	✓	✓	Easy
454	4Sum II	✓	✓	✓	Medium
453	Minimum Moves to Equal Array Elements	✓	✓	✓	Easy
452	Minimum Number of Arrows to Burst Balloons	✓	✓	✓	Medium
451	Sort Characters By Frequency	✓	✓	✓	Medium
450	Delete Node in a BST	✓	✓	✓	Medium
449		✓	✓	✓	Medium
448	Find All Numbers Disappeared in an Array	✓	✓	✓	Easy
447	Number of Boomerangs	✓	✓	✓	Easy
446	Arithmetic Slices II - Subsequence	✓	✓	✓	Hard
445	Add Two Numbers II	✓	✓	✓	Medium
444		✓	✓	✓	Medium
443	String Compression	✓	✓	✓	Easy
442	Find All Duplicates in an Array	✓	✓	✓	Medium
441	Arranging Coins	✓	✓	✓	Easy
440	K-th Smallest in Lexicographical Order	✓	✓	✓	Hard
439		✓	✓	✓	Medium
438	Find All Anagrams in a String	✓	✓	✓	Easy
437	Path Sum III	✓	✓	✓	Easy
436	Find Right Interval	✓	✓	✓	Medium
435	Non-overlapping Intervals	✓	✓	✓	Medium
434	Number of Segments in a String	✓	✓	✓	Easy
433	Minimum Genetic Mutation	✓	✓	✓	Medium
432	All O`one Data Structure	✓	✓	✓	Hard
431		✓	✓	✓	Hard
430		✓	✓	✓	Medium
429		✓	✓	✓	Easy
428		✓	✓	✓	Hard
427		✓	✓	✓	Easy
426		✓	✓	✓	Medium
425		✓	✓	✓	Hard
424	Longest Repeating Character Replacement	✓	✓	✓	Medium
423	Reconstruct Original Digits from English	✓	✓	✓	Medium
422		✓	✓	✓	Easy
421	Maximum XOR of Two Numbers in an Array	✓	✓	✓	Medium
420	Strong Password Checker	✓	✓	✓	Hard
419	Battleships in a Board	✓	✓	✓	Medium
418		✓	✓	✓	Medium
417	Pacific Atlantic Water Flow	✓	✓	✓	Medium
416	Partition Equal Subset Sum	✓	✓	✓	Medium
415	Add Strings	✓	✓	✓	Easy
414	Third Maximum Number	✓	✓	✓	Easy
413	Arithmetic Slices	✓	✓	✓	Medium
412	Fizz Buzz	✓	✓	✓	Easy
411		✓	✓	✓	Hard
410	Split Array Largest Sum	✓	✓	✓	Hard
409	Longest Palindrome	✓	✓	✓	Easy
408		✓	✓	✓	Easy
407	Trapping Rain Water II	✓	✓	✓	Hard
406	Queue Reconstruction by Height	✓	✓	✓	Medium
405	Convert a Number to Hexadecimal	✓	✓	✓	Easy
404	Sum of Left Leaves	✓	✓	✓	Easy
403	Frog Jump	✓	✓	✓	Hard
402	Remove K Digits	✓	✓	✓	Medium
401	Binary Watch	✓	✓	✓	Easy
400	Nth Digit	✓	✓	✓	Easy
399	Evaluate Division	✓	✓	✓	Medium
398	Random Pick Index	✓	✓	✓	Medium
397	Integer Replacement	✓	✓	✓	Medium
396	Rotate Function	✓	✓	✓	Medium
395	Longest Substring with At Least K Repeating Characters	✓	✓	✓	Medium
394	Decode String	✓	✓	✓	Medium
393	UTF-8 Validation	✓	✓	✓	Medium
392	Is Subsequence	✓	✓	✓	Medium
391	Perfect Rectangle	✓	✓	✓	Hard
390	Elimination Game	✓	✓	✓	Medium
389	Find the Difference	✓	✓	✓	Easy
388	Longest Absolute File Path	✓	✓	✓	Medium
387	First Unique Character in a String	✓	✓	✓	Easy
386	Lexicographical Numbers	✓	✓	✓	Medium
385	Mini Parser	✓	✓	✓	Medium
384	Shuffle an Array	✓	✓	✓	Medium
383	Ransom Note	✓	✓	✓	Easy
382	Linked List Random Node	✓	✓	✓	Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed	✓	✓	✓	Hard
380	Insert Delete GetRandom O(1)	✓	✓	✓	Medium
379		✓	✓	✓	Medium
378	Kth Smallest Element in a Sorted Matrix	✓	✓	✓	Medium
377	Combination Sum IV	✓	✓	✓	Medium
376	Wiggle Subsequence	✓	✓	✓	Medium
375	Guess Number Higher or Lower II	✓	✓	✓	Medium
374	Guess Number Higher or Lower	✓	✓	✓	Easy
373	Find K Pairs with Smallest Sums	✓	✓	✓	Medium
372	Super Pow	✓	✓	✓	Medium
371	Sum of Two Integers	✓	✓	✓	Easy
370		✓	✓	✓	Medium
369		✓	✓	✓	Medium
368	Largest Divisible Subset	✓	✓	✓	Medium
367	Valid Perfect Square	✓	✓	✓	Easy
366		✓	✓	✓	Medium
365	Water and Jug Problem	✓	✓	✓	Medium
364		✓	✓	✓	Medium
363	Max Sum of Rectangle No Larger Than K	✓	✓	✓	Hard
362		✓	✓	✓	Medium
361		✓	✓	✓	Medium
360		✓	✓	✓	Medium
359		✓	✓	✓	Easy
358		✓	✓	✓	Hard
357	Count Numbers with Unique Digits	✓	✓	✓	Medium
356		✓	✓	✓	Medium
355		✓	✓	✓	Medium
354	Russian Doll Envelopes	✓	✓	✓	Hard
353		✓	✓	✓	Medium
352	Data Stream as Disjoint Intervals	✓	✓	✓	Hard
351	Android Unlock Patterns $	✓	✓	✓	Medium
350	Intersection of Two Arrays II	✓	✓	✓	Easy
349	Intersection of Two Arrays	✓	✓	✓	Easy
348	Design Tic-Tac-Toe $	✓	✓	✓	Medium
347	Top K Frequent Elements	✓	✓	✓	Medium
346	Moving Average from Data Stream $	✓	✓	✓	Easy
345	Reverse Vowels of a String	✓	✓	✓	Easy
344	Reverse String	✓	✓	✓	Easy
343	Integer Break	✓	✓	✓	Medium
342	Power of Four	✓	✓	✓	Easy
341	Flatten Nested List Iterator	✓	✓	✓	Medium
340	Longest Substring with At Most K Distinct Characters $	✓	✓	✓	Hard
339	Nested List Weight Sum $	✓	✓	✓	Easy
338	Counting Bits	✓	✓	✓	Medium
337	House Robber III	✓	✓	✓	Medium
336	Palindrome Pairs	✓	✓	✓	Hard
335	Self Crossing	✓	✓	✓	Hard
334	Increasing Triplet Subsequence	✓	✓	✓	Medium
333	Largest BST Subtree $	✓	✓	✓	Medium
332	Reconstruct Itinerary	✓	✓	✓	Medium
331	Verify Preorder Serialization of a Binary Tree	✓	✓	✓	Medium
330	Patching Array	✓	✓	✓	Hard
329	Longest Increasing Path in a Matrix	✓	✓	✓	Hard
328	Odd Even Linked List	✓	✓	✓	Medium
327	Count of Range Sum	✓	✓	✓	Hard
326	Power of Three	✓	✓	✓	Easy
325	Maximum Size Subarray Sum Equals k $	✓	✓	✓	Medium
324	Wiggle Sort II	✓	✓	✓	Medium
323	Number of Connected Components in an Undirected Graph $	✓	✓	✓	Medium
322	Coin Change	✓	✓	✓	Medium
321	Create Maximum Number	✓	✓	✓	Hard
320	Generalized Abbreviation $	✓	✓	✓	Medium
319	Bulb Switcher	✓	✓	✓	Medium
318	Maximum Product of Word Lengths	✓	✓	✓	Medium
317	Shortest Distance from All Buildings $	✓	✓	✓	Hard
316	Remove Duplicate Letters	✓	✓	✓	Hard
315	Count of Smaller Numbers After Self	✓	✓	✓	Hard
314	Binary Tree Vertical Order Traversal $	✓	✓	✓	Medium
313	Super Ugly Number	✓	✓	✓	Medium
312	Burst Balloons	✓	✓	✓	Hard
311	Sparse Matrix Multiplication $	✓	✓	✓	Medium
310	Minimum Height Trees	✓	✓	✓	Medium
309	Best Time to Buy and Sell Stock with Cooldown	✓	✓	✓	Medium
308	Range Sum Query 2D - Mutable	✓	✓	✓	Hard
307	Range Sum Query - Mutable	✓	✓	✓	Medium
306	Additive Number	✓	✓	✓	Medium
305	Number of Islands II $	✓	✓	✓	Hard
304	Range Sum Query 2D - Immutable	✓	✓	✓	Medium
303	Range Sum Query - Immutable	✓	✓	✓	Easy
302	Smallest Rectangle Enclosing Black Pixels $	✓	✓	✓	Hard
301	Remove Invalid Parentheses	✓	✓	✓	Hard
300	Longest Increasing Subsequence	✓	✓	✓	Medium
299	Bulls and Cows	✓	✓	✓	Medium
298	Binary Tree Longest Consecutive Sequence $	✓	✓	✓	Medium
297	Serialize and Deserialize Binary Tree	✓	✓	✓	Hard
296	Best Meeting Point $	✓	✓	✓	Hard
295	Find Median from Data Stream	✓	✓	✓	Hard
294	Flip Game II $	✓	✓	✓	Medium
293	Flip Game $	✓	✓	✓	Easy
292	Nim Game	✓	✓	✓	Easy
291	Word Pattern II $	✓	✓	✓	Hard
290	Word Pattern	✓	✓	✓	Easy
289	Game of Life	✓	✓	✓	Medium
288	Unique Word Abbreviation $	✓	✓	✓	Medium
287	Find the Duplicate Number	✓	✓	✓	Medium
286	Walls and Gates $	✓	✓	✓	Medium
285	Inorder Successor in BST $	✓	✓	✓	Medium
284	Peeking Iterator	✓	✓	✓	Medium
283	Move Zeroes	✓	✓	✓	Easy
282	Expression Add Operators	✓	✓	✓	Hard
281	Zigzag Iterator $	✓	✓	✓	Medium
280	Wiggle Sort	✓	✓	✓	Medium
279	Perfect Squares	✓	✓	✓	Medium
278	First Bad Version	✓	✓	✓	Easy
277	Find the Celebrity $	✓	✓	✓	Medium
276	Paint Fence $	✓	✓	✓	Easy
275	H-Index II	✓	✓	✓	Medium
274	H-Index	✓	✓	✓	Medium
273	Integer to English Words	✓	✓	✓	Hard
272	Closest Binary Search Tree Value II $	✓	✓	✓	Hard
271	Encode and Decode Strings $	✓	✓	✓	Medium
270	Closest Binary Search Tree Value $	✓	✓	✓	Easy
269	Alien Dictionary $	✓	✓	✓	Hard
268	Missing Number	✓	✓	✓	Easy
267	Palindrome Permutation II $	✓	✓	✓	Medium
266	Palindrome Permutation $	✓	✓	✓	Easy
265	Paint House II $	✓	✓	✓	Hard
264	Ugly Number II	✓	✓	✓	Medium
263	Ugly Number	✓	✓	✓	Easy
262	Trips and Users	✓	✓	✓	Hard
261	Graph Valid Tree $	✓	✓	✓	Medium
260	Single Number III	✓	✓	✓	Medium
259	3Sum Smaller $	✓	✓	✓	Medium
258	Add Digits	✓	✓	✓	Easy
257	Binary Tree Paths	✓	✓	✓	Easy
256	Paint House $	✓	✓	✓	Easy
255	Verify Preorder Sequence in Binary Search Tree $	✓	✓	✓	Medium
254	Factor Combinations $	✓	✓	✓	Medium
253	Meeting Rooms II $	✓	✓	✓	Medium
252	Meeting Rooms $	✓	✓	✓	Easy
251	Flatten 2D Vector $	✓	✓	✓	Medium
250	Count Univalue Subtrees $	✓	✓	✓	Medium
249	Group Shifted Strings $	✓	✓	✓	Medium
248	Strobogrammatic Number III $	✓	✓	✓	Hard
247	Strobogrammatic Number II $	✓	✓	✓	Medium
246	Strobogrammatic Number $	✓	✓	✓	Easy
245	Shortest Word Distance III $	✓	✓	✓	Medium
244	Shortest Word Distance II $	✓	✓	✓	Medium
243	Shortest Word Distance $	✓	✓	✓	Easy
242	Valid Anagram	✓	✓	✓	Easy
241	Different Ways to Add Parentheses	✓	✓	✓	Medium
240	Search a 2D Matrix II	✓	✓	✓	Medium
239	Sliding Window Maximum	✓	✓	✓	Hard
238	Product of Array Except Self	✓	✓	✓	Medium
237	Delete Node in a Linked List	✓	✓	✓	Easy
236	Lowest Common Ancestor of a Binary Tree	✓	✓	✓	Medium
235	Lowest Common Ancestor of a Binary Search Tree	✓	✓	✓	Easy
234	Palindrome Linked List	✓	✓	✓	Easy
233	Number of Digit One	✓	✓	✓	Hard
232	Implement Queue using Stacks	✓	✓	✓	Easy
231	Power of Two	✓	✓	✓	Easy
230	Kth Smallest Element in a BST	✓	✓	✓	Medium
229	Majority Element II	✓	✓	✓	Medium
228	Summary Ranges	✓	✓	✓	Medium
227	Basic Calculator II	✓	✓	✓	Medium
226	Invert Binary Tree	✓	✓	✓	Easy
225	Implement Stack using Queues	✓	✓	✓	Easy
224	Basic Calculator	✓	✓	✓	Hard
223	Rectangle Area	✓	✓	✓	Medium
222	Count Complete Tree Nodes	✓	✓	✓	Medium
221	Maximal Square	✓	✓	✓	Medium
220	Contains Duplicate III	✓	✓	✓	Medium
219	Contains Duplicate II	✓	✓	✓	Easy
218	The Skyline Problem	✓	✓	✓	Hard
217	Contains Duplicate	✓	✓	✓	Easy
216	Combination Sum III	✓	✓	✓	Medium
215	Kth Largest Element in an Array	✓	✓	✓	Medium
214	Shortest Palindrome	✓	✓	✓	Hard
213	House Robber II	✓	✓	✓	Medium
212	Word Search II	✓	✓	✓	Hard
211	Add and Search Word - Data structure design	✓	✓	✓	Medium
210	Course Schedule II	✓	✓	✓	Medium
209	Minimum Size Subarray Sum	✓	✓	✓	Medium
208	Implement Trie (Prefix Tree)	✓	✓	✓	Medium
207	Course Schedule	✓	✓	✓	Medium
206	Reverse Linked List	✓	✓	✓	Easy
205	Isomorphic Strings	✓	✓	✓	Easy
204	Count Primes	✓	✓	✓	Easy
203	Remove Linked List Elements	✓	✓	✓	Easy
202	Happy Number	✓	✓	✓	Easy
201	Bitwise AND of Numbers Range	✓	✓	✓	Medium
200	Number of Islands	✓	✓	✓	Medium
199	Binary Tree Right Side View	✓	✓	✓	Medium
198	House Robber	✓	✓	✓	Easy
197	Rising Temperature	✓	✓	✓	Easy
196	Delete Duplicate Emails	✓	✓	✓	Easy
195	Tenth Line	✓	✓	✓	Easy
194	Transpose File	✓	✓	✓	Medium
193	Valid Phone Numbers	✓	✓	✓	Easy
192	Word Frequency	✓	✓	✓	Medium
191	Number of 1 Bits	✓	✓	✓	Easy
190	Reverse Bits	✓	✓	✓	Easy
189	Rotate Array	✓	✓	✓	Easy
188	Best Time to Buy and Sell Stock IV	✓	✓	✓	Hard
187	Repeated DNA Sequences	✓	✓	✓	Medium
186	Reverse Words in a String II $	✓	✓	✓	Medium
185	Department Top Three Salaries	✓	✓	✓	Hard
184	Department Highest Salary	✓	✓	✓	Medium
183	Customers Who Never Order	✓	✓	✓	Easy
182	Duplicate Emails	✓	✓	✓	Easy
181	Employees Earning More Than Their Managers	✓	✓	✓	Easy
180	Consecutive Numbers	✓	✓	✓	Medium
179	Largest Number	✓	✓	✓	Medium
178	Rank Scores	✓	✓	✓	Medium
177	Nth Highest Salary	✓	✓	✓	Medium
176	Second Highest Salary	✓	✓	✓	Easy
175	Combine Two Tables	✓	✓	✓	Easy
174	Dungeon Game	✓	✓	✓	Hard
173	Binary Search Tree Iterator	✓	✓	✓	Medium
172	Factorial Trailing Zeroes	✓	✓	✓	Easy
171	Excel Sheet Column Number	✓	✓	✓	Easy
170	Two Sum III - Data structure design $	✓	✓	✓	Easy
169	Majority Element	✓	✓	✓	Easy
168	Excel Sheet Column Title	✓	✓	✓	Easy
167	Two Sum II - Input array is sorted	✓	✓	✓	Easy
166	Fraction to Recurring Decimal	✓	✓	✓	Medium
165	Compare Version Numbers	✓	✓	✓	Medium
164	Maximum Gap	✓	✓	✓	Hard
163	Missing Ranges $	✓	✓	✓	Medium
162	Find Peak Element	✓	✓	✓	Medium
161	One Edit Distance $	✓	✓	✓	Medium
160	Intersection of Two Linked Lists	✓	✓	✓	Easy
159	Longest Substring with At Most Two Distinct Characters $	✓	✓	✓	Hard
158	Read N Characters Given Read4 II $	✓	✓	✓	Hard
157	Read N Characters Given Read4 $	✓	✓	✓	Easy
156	Binary Tree Upside Down $	✓	✓	✓	Medium
155	Min Stack	✓	✓	✓	Easy
154	Find Minimum in Rotated Sorted Array II	✓	✓	✓	Hard
153	Find Minimum in Rotated Sorted Array	✓	✓	✓	Medium
152	Maximum Product Subarray	✓	✓	✓	Medium
151	Reverse Words in a String	✓	✓	✓	Medium
150	Evaluate Reverse Polish Notation	✓	✓	✓	Medium
149	Max Points on a Line	✓	✓	✓	Hard
148	Sort List	✓	✓	✓	Medium
147	Insertion Sort List	✓	✓	✓	Medium
146	LRU Cache	✓	✓	✓	Hard
145	Binary Tree Postorder Traversal	✓	✓	✓	Hard
144	Binary Tree Preorder Traversal	✓	✓	✓	Medium
143	Reorder List	✓	✓	✓	Medium
142	Linked List Cycle II	✓	✓	✓	Medium
141	Linked List Cycle	✓	✓	✓	Easy
140	Word Break II	✓	✓	✓	Hard
139	Word Break	✓	✓	✓	Medium
138	Copy List with Random Pointer	✓	✓	✓	Medium
137	Single Number II	✓	✓	✓	Medium
136	Single Number	✓	✓	✓	Easy
135	Candy	✓	✓	✓	Hard
134	Gas Station	✓	✓	✓	Medium
133	Clone Graph	✓	✓	✓	Medium
132	Palindrome Partitioning II	✓	✓	✓	Hard
131	Palindrome Partitioning	✓	✓	✓	Medium
130	Surrounded Regions	✓	✓	✓	Medium
129	Sum Root to Leaf Numbers	✓	✓	✓	Medium
128	Longest Consecutive Sequence	✓	✓	✓	Hard
127	Word Ladder	✓	✓	✓	Medium
126	Word Ladder II	✓	✓	✓	Hard
125	Valid Palindrome	✓	✓	✓	Easy
124	Binary Tree Maximum Path Sum	✓	✓	✓	Hard
123	Best Time to Buy and Sell Stock III	✓	✓	✓	Hard
122	Best Time to Buy and Sell Stock II	✓	✓	✓	Easy
121	Best Time to Buy and Sell Stock	✓	✓	✓	Easy
120	Triangle	✓	✓	✓	Medium
119	Pascal's Triangle II	✓	✓	✓	Easy
118	Pascal's Triangle	✓	✓	✓	Easy
117	Populating Next Right Pointers in Each Node II	✓	✓	✓	Medium
116	Populating Next Right Pointers in Each Node	✓	✓	✓	Medium
115	Distinct Subsequences	✓	✓	✓	Hard
114	Flatten Binary Tree to Linked List	✓	✓	✓	Medium
113	Path Sum II	✓	✓	✓	Medium
112	Path Sum	✓	✓	✓	Easy
111	Minimum Depth of Binary Tree	✓	✓	✓	Easy
110	Balanced Binary Tree	✓	✓	✓	Easy
109	Convert Sorted List to Binary Search Tree	✓	✓	✓	Medium
108	Convert Sorted Array to Binary Search Tree	✓	✓	✓	Easy
107	Binary Tree Level Order Traversal II	✓	✓	✓	Easy
106	Construct Binary Tree from Inorder and Postorder Traversal	✓	✓	✓	Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	✓	✓	✓	Medium
104	Maximum Depth of Binary Tree	✓	✓	✓	Easy
103	Binary Tree Zigzag Level Order Traversal	✓	✓	✓	Medium
102	Binary Tree Level Order Traversal	✓	✓	✓	Medium
101	Symmetric Tree	✓	✓	✓	Easy
100	Same Tree	✓	✓	✓	Hard
99	Recover Binary Search Tree	✓	✓	✓	Medium
98	Validate Binary Search Tree	✓	✓	✓	Medium
97	Interleaving String	✓	✓	✓	Medium
96	Unique Binary Search Trees	✓	✓	✓	Medium
95	Unique Binary Search Trees II	✓	✓	✓	Medium
94	Binary Tree Inorder Traversal	✓	✓	✓	Medium
93	Restore IP Addresses	✓	✓	✓	Medium
92	Reverse Linked List II	✓	✓	✓	Medium
91	Decode Ways	✓	✓	✓	Medium
90	Subsets II	✓	✓	✓	Medium
89	Gray Code	✓	✓	✓	Medium
88	Merge Sorted Array	✓	✓	✓	Easy
87	Scramble String	✓	✓	✓	Hard
86	Partition List	✓	✓	✓	Medium
85	Maximal Rectangle	✓	✓	✓	Hard
84	Largest Rectangle in Histogram	✓	✓	✓	Hard
83	Remove Duplicates from Sorted List	✓	✓	✓	Easy
82	Remove Duplicates from Sorted List II	✓	✓	✓	Medium
81	Search in Rotated Sorted Array II	✓	✓	✓	Medium
80	Remove Duplicates from Sorted Array II	✓	✓	✓	Medium
79	Word Search	✓	✓	✓	Medium
78	Subsets	✓	✓	✓	Medium
77	Combinations	✓	✓	✓	Medium
76	Minimum Window Substring	✓	✓	✓	Hard
75	Sort Colors	✓	✓	✓	Medium
74	Search a 2D Matrix	✓	✓	✓	Medium
73	Set Matrix Zeroes	✓	✓	✓	Medium
72	Edit Distance	✓	✓	✓	Hard
71	Simplify Path	✓	✓	✓	Medium
70	Climbing Stairs	✓	✓	✓	Easy
69	Sqrt(x)	✓	✓	✓	Easy
68	Text Justification	✓	✓	✓	Hard
67	Add Binary	✓	✓	✓	Easy
66	Plus One	✓	✓	✓	Easy
65	Valid Number	✓	✓	✓	Hard
64	Minimum Path Sum	✓	✓	✓	Medium
63	Unique Paths II	✓	✓	✓	Medium
62	Unique Paths	✓	✓	✓	Medium
61	Rotate List	✓	✓	✓	Medium
60	Permutation Sequence	✓	✓	✓	Medium
59	Spiral Matrix II	✓	✓	✓	Medium
58	Length of Last Word	✓	✓	✓	Easy
57	Insert Interval	✓	✓	✓	Hard
56	Merge Intervals	✓	✓	✓	Medium
55	Jump Game	✓	✓	✓	Medium
54	Spiral Matrix	✓	✓	✓	Medium
53	Maximum Subarray	✓	✓	✓	Easy
52	N-Queens II	✓	✓	✓	Hard
51	N-Queens	✓	✓	✓	Hard
50	Pow(x, n)	✓	✓	✓	Medium
49	Group Anagrams	✓	✓	✓	Medium
48	Rotate Image	✓	✓	✓	Medium
47	Permutations II	✓	✓	✓	Medium
46	Permutations	✓	✓	✓	Medium
45	Jump Game II	✓	✓	✓	Hard
44	Wildcard Matching	✓	✓	✓	Hard
43	Multiply Strings	✓	✓	✓	Medium
42	Trapping Rain Water	✓	✓	✓	Hard
41	First Missing Positive	✓	✓	✓	Hard
40	Combination Sum II	✓	✓	✓	Medium
39	Combination Sum	✓	✓	✓	Medium
38	Count and Say	✓	✓	✓	Easy
37	Sudoku Solver	✓	✓	✓	Hard
36	Valid Sudoku	✓	✓	✓	Medium
35	Search Insert Position	✓	✓	✓	Easy
34	Find First and Last Position of Element in Sorted Array	✓	✓	✓	Medium
33	Search in Rotated Sorted Array	✓	✓	✓	Medium
32	Longest Valid Parentheses	✓	✓	✓	Hard
31	Next Permutation	✓	✓	✓	Medium
30	Substring with Concatenation of All Words	✓	✓	✓	Hard
29	Divide Two Integers	✓	✓	✓	Medium
28	Implement strStr()	✓	✓	✓	Easy
27	Remove Element	✓	✓	✓	Easy
26	Remove Duplicates from Sorted Array	✓	✓	✓	Easy
25	Reverse Nodes in k-Group	✓	✓	✓	Hard
24	Swap Nodes in Pairs	✓	✓	✓	Medium
23	Merge k Sorted Lists	✓	✓	✓	Hard
22	Generate Parentheses	✓	✓	✓	Medium
21	Merge Two Sorted Lists	✓	✓	✓	Easy
20	Valid Parentheses	✓	✓	✓	Easy
19	Remove Nth Node From End of List	✓	✓	✓	Medium
18	4Sum	✓	✓	✓	Medium
17	Letter Combinations of a Phone Number	✓	✓	✓	Medium
16	3Sum Closest	✓	✓	✓	Medium
15	3Sum	✓	✓	✓	Medium
14	Longest Common Prefix	✓	✓	✓	Easy
13	Roman to Integer	✓	✓	✓	Easy
12	Integer to Roman	✓	✓	✓	Medium
11	Container With Most Water	✓	✓	✓	Medium
10	Regular Expression Matching	✓	✓	✓	Hard
9	Palindrome Number	✓	✓	✓	Easy
8	String to Integer (atoi)	✓	✓	✓	Medium
7	Reverse Integer	✓	✓	✓	Easy
6	ZigZag Conversion	✓	✓	✓	Medium
5	Longest Palindromic Substring	✓	✓	✓	Medium
4	Median of Two Sorted Arrays	✓	✓	✓	Hard
3	Longest Substring Without Repeating Characters	✓	✓	✓	Medium
2	Add Two Numbers	✓	✓	✓	Medium
1	Two Sum	✓	✓	✓	Easy

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License

This is under an MIT license. See the LICENSE for more information.