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Leetcode

逆序Serial 题目Title 难度Difficulty
1024 视频拼接 - Video Stitching Medium
1023 驼峰式匹配 - Camelcase Matching Medium
1022 从根到叶的二进制数之和 - Sum of Root To Leaf Binary Numbers Easy
1021 删除最外层的括号 - Remove Outermost Parentheses Easy
1020 飞地的数量 - Number of Enclaves Medium
1019 链表中的下一个更大节点 - Next Greater Node In Linked List Medium
1018 可被 5 整除的二进制前缀 - Binary Prefix Divisible By 5 Easy
1017 负二进制转换 - Convert to Base -2 Medium
1016 子串能表示从 1 到 N 数字的二进制串 - Binary String With Substrings Representing 1 To N Medium
1015 可被 K 整除的最小整数 - Smallest Integer Divisible by K Medium
1014 最佳观光组合 - Best Sightseeing Pair Medium
1013 将数组分成和相等的三个部分 - Partition Array Into Three Parts With Equal Sum Easy
1012 至少有 1 位重复的数字 - Numbers With 1 Repeated Digit Hard
1011 在 D 天内送达包裹的能力 - Capacity To Ship Packages Within D Days Medium
1010 总持续时间可被 60 整除的歌曲 - Pairs of Songs With Total Durations Divisible by 60 Easy
1009 十进制整数的补码 - Complement of Base 10 Integer Easy
1008 先序遍历构造二叉树 - Construct Binary Search Tree from Preorder Traversal Medium
1007 行相等的最少多米诺旋转 - Minimum Domino Rotations For Equal Row Medium
1006 笨阶乘 - Clumsy Factorial Medium
1005 K 次取反后最大化的数组和 - Maximize Sum Of Array After K Negations Easy
1004 最大连续1的个数 III - Max Consecutive Ones III Medium
1003 检查替换后的词是否有效 - Check If Word Is Valid After Substitutions Medium
1002 查找常用字符 - Find Common Characters Easy
1001 网格照明 - Grid Illumination Hard
1000 合并石头的最低成本 - Minimum Cost to Merge Stones Hard
999 车的可用捕获量 - Available Captures for Rook Easy
998 最大二叉树 II - Maximum Binary Tree II Medium
997 找到小镇的法官 - Find the Town Judge Easy
996 正方形数组的数目 - Number of Squareful Arrays Hard
995 K 连续位的最小翻转次数 - Minimum Number of K Consecutive Bit Flips Hard
994 腐烂的橘子 - Rotting Oranges Easy
993 二叉树的堂兄弟节点 - Cousins in Binary Tree Easy
992 K 个不同整数的子数组 - Subarrays with K Different Integers Hard
991 坏了的计算器 - Broken Calculator Medium
990 等式方程的可满足性 - Satisfiability of Equality Equations Medium
989 数组形式的整数加法 - Add to Array-Form of Integer Easy
988 从叶结点开始的最小字符串 - Smallest String Starting From Leaf Medium
987 二叉树的垂序遍历 - Vertical Order Traversal of a Binary Tree Medium
986 区间列表的交集 - Interval List Intersections Medium
985 查询后的偶数和 - Sum of Even Numbers After Queries Easy
984 不含 AAA 或 BBB 的字符串 - String Without AAA or BBB Medium
983 最低票价 - Minimum Cost For Tickets Medium
982 按位与为零的三元组 - Triples with Bitwise AND Equal To Zero Hard
981 基于时间的键值存储 - Time Based Key-Value Store Medium
980 不同路径 III - Unique Paths III Hard
979 在二叉树中分配硬币 - Distribute Coins in Binary Tree Medium
978 最长湍流子数组 - Longest Turbulent Subarray Medium
977 有序数组的平方 - Squares of a Sorted Array Easy
976 三角形的最大周长 - Largest Perimeter Triangle Easy
975 奇偶跳 - Odd Even Jump Hard
974 和可被 K 整除的子数组 - Subarray Sums Divisible by K Medium
973 最接近原点的 K 个点 - K Closest Points to Origin Medium
972 相等的有理数 - Equal Rational Numbers Hard
971 翻转二叉树以匹配先序遍历 - Flip Binary Tree To Match Preorder Traversal Medium
970 强整数 - Powerful Integers Easy
969 煎饼排序 - Pancake Sorting Medium
968 监控二叉树 - Binary Tree Cameras Hard
967 连续差相同的数字 - Numbers With Same Consecutive Differences Medium
966 元音拼写检查器 - Vowel Spellchecker Medium
965 单值二叉树 - Univalued Binary Tree Easy
964 表示数字的最少运算符 - Least Operators to Express Number Hard
963 最小面积矩形 II - Minimum Area Rectangle II Medium
962 最大宽度坡 - Maximum Width Ramp Medium
961 重复 N 次的元素 - N-Repeated Element in Size 2N Array Easy
960 删列造序 --- - Delete Columns to Make Sorted III Hard
959 由斜杠划分区域 - Regions Cut By Slashes Medium
958 二叉树的完全性检验 - Check Completeness of a Binary Tree Medium
957 N天后的牢房 - Prison Cells After N Days Medium
956 最高的广告牌 - Tallest Billboard Hard
955 删列造序 -- - Delete Columns to Make Sorted II Medium
954 二倍数对数组 - Array of Doubled Pairs Medium
953 验证外星语词典 - Verifying an Alien Dictionary Easy
952 按公因数计算最大组件大小 - Largest Component Size by Common Factor Hard
951 翻转等价二叉树 - Flip Equivalent Binary Trees Medium
950 按递增顺序显示卡牌 - Reveal Cards In Increasing Order Medium
949 给定数字能组成的最大时间 - Largest Time for Given Digits Easy
948 令牌放置 - Bag of Tokens Medium
947 移除最多的同行或同列石头 - Most Stones Removed with Same Row or Column Medium
946 验证栈序列 - Validate Stack Sequences Medium
945 使数组唯一的最小增量 - Minimum Increment to Make Array Unique Medium
944 删除列以使之有序 - Delete Columns to Make Sorted Easy
943 最短超级串 - Find the Shortest Superstring Hard
942 增减字符串匹配 - DI String Match Easy
941 有效的山脉数组 - Valid Mountain Array Easy
940 不同的子序列 II - Distinct Subsequences II Hard
939 最小面积矩形 - Minimum Area Rectangle Medium
938 二叉搜索树的范围和 - Range Sum of BST Medium
937 重新排列日志文件 - Reorder Log Files Easy
936 戳印序列 - Stamping The Sequence Hard
935 骑士拨号器 - Knight Dialer Medium
934 最短的桥 - Shortest Bridge Medium
933 最近的请求次数 - Number of Recent Calls Easy
932 漂亮数组 - Beautiful Array Medium
931 下降路径最小和 - Minimum Falling Path Sum Medium
930 和相同的二元子数组 - Binary Subarrays With Sum Medium
929 独特的电子邮件地址 - Unique Email Addresses Easy
928 尽量减少恶意软件的传播 II - Minimize Malware Spread II Hard
927 三等分 - Three Equal Parts Hard
926 将字符串翻转到单调递增 - Flip String to Monotone Increasing Medium
925 长按键入 - Long Pressed Name Easy
924 尽量减少恶意软件的传播 - Minimize Malware Spread Hard
923 三数之和的多种可能 - 3Sum With Multiplicity Medium
922 按奇偶排序数组 II - Sort Array By Parity II Easy
921 使括号有效的最少添加 - Minimum Add to Make Parentheses Valid Medium
920 播放列表的数量 - Number of Music Playlists Hard
919 完全二叉树插入器 - Complete Binary Tree Inserter Medium
918 环形子数组的最大和 - Maximum Sum Circular Subarray Medium
917 仅仅反转字母 - Reverse Only Letters Easy
916 单词子集 - Word Subsets Medium
915 将分区数组分成不相交的间隔 - Partition Array into Disjoint Intervals Medium
914 一副牌中的X - X of a Kind in a Deck of Cards Easy
913 猫与老鼠 - Cat and Mouse Hard
912
911 在线选举 - Online Election Medium
910 最小差值 II - Smallest Range II Medium
909 蛇梯棋 - Snakes and Ladders Medium
908 最小差值 I - Smallest Range I Easy
907 子数组的最小值之和 - Sum of Subarray Minimums Medium
906 超级回文数 - Super Palindromes Hard
905 按奇偶排序数组 - Sort Array By Parity Easy
904 水果成篮 - Fruit Into Baskets Medium
903 DI 序列的有效排列 - Valid Permutations for DI Sequence Hard
902 最大为 N 的数字组合 - Numbers At Most N Given Digit Set Hard
901 股票价格跨度 - Online Stock Span Medium
900 RLE 迭代器 - RLE Iterator Medium
899 有序队列 - Orderly Queue Hard
898 子数组按位或操作 - Bitwise ORs of Subarrays Medium
897 递增顺序查找树 - Increasing Order Search Tree Easy
896 单调数列 - Monotonic Array Easy
895 最大频率栈 - Maximum Frequency Stack Hard
894 所有可能的满二叉树 - All Possible Full Binary Trees Medium
893 特殊等价字符串组 - Groups of Special-Equivalent Strings Easy
892 三维形体的表面积 - Surface Area of 3D Shapes Easy
891 子序列宽度之和 - Sum of Subsequence Widths Hard
890 查找和替换模式 - Find and Replace Pattern Medium
889 根据前序和后序遍历构造二叉树 - Construct Binary Tree from Preorder and Postorder Traversal Medium
888 公平的糖果交换 - Fair Candy Swap Easy
887 鸡蛋掉落 - Super Egg Drop Hard
886 可能的二分法 - Possible Bipartition Medium
885 螺旋矩阵 III - Spiral Matrix III Medium
884 两句话中的不常见单词 - Uncommon Words from Two Sentences Easy
883 三维形体投影面积 - Projection Area of 3D Shapes Easy
882 细分图中的可到达结点 - Reachable Nodes In Subdivided Graph Hard
881 救生艇 - Boats to Save People Medium
880 索引处的解码字符串 - Decoded String at Index Medium
879 盈利计划 - Profitable Schemes Hard
878 第 N 个神奇数字 - Nth Magical Number Hard
877 石子游戏 - Stone Game Medium
876 链表的中间结点 - Middle of the Linked List Easy
875 爱吃香蕉的珂珂 - Koko Eating Bananas Medium
874 模拟行走机器人 - Walking Robot Simulation Easy
873 最长的斐波那契子序列的长度 - Length of Longest Fibonacci Subsequence Medium
872 叶子相似的树 - Leaf-Similar Trees Easy
871 最低加油次数 - Minimum Number of Refueling Stops Hard
870 优势洗牌 - Advantage Shuffle Medium
869 重新排序得到 2 的幂 - Reordered Power of 2 Medium
868 二进制间距 - Binary Gap Easy
867 转置矩阵 - Transpose Matrix Easy
866 回文素数 - Prime Palindrome Medium
865 具有所有最深结点的最小子树 - Smallest Subtree with all the Deepest Nodes Medium
864 获取所有钥匙的最短路径 - Shortest Path to Get All Keys Hard
863 二叉树中所有距离为 K 的结点 - All Nodes Distance K in Binary Tree Medium
862 和至少为 K 的最短子数组 - Shortest Subarray with Sum at Least K Hard
861 翻转矩阵后的得分 - Score After Flipping Matrix Medium
860 柠檬水找零 - Lemonade Change Easy
859 亲密字符串 - Buddy Strings Easy
858 镜面反射 - Mirror Reflection Medium
857 雇佣 K 名工人的最低成本 - Minimum Cost to Hire K Workers Hard
856 括号的分数 - Score of Parentheses Medium
855 考场就座 - Exam Room Medium
854 相似度为 K 的字符串 - K-Similar Strings Hard
853 车队 - Car Fleet Medium
852 山脉数组的峰顶索引 - Peak Index in a Mountain Array Easy
851 喧闹和富有 - Loud and Rich Medium
850 矩形面积 II - Rectangle Area II Hard
849 到最近的人的最大距离 - Maximize Distance to Closest Person Easy
848 字母移位 - Shifting Letters Medium
847 访问所有节点的最短路径 - Shortest Path Visiting All Nodes Hard
846 一手顺子 - Hand of Straights Medium
845 数组中的最长山脉 - Longest Mountain in Array Medium
844 比较含退格的字符串 - Backspace String Compare Easy
843 猜猜这个单词 - Guess the Word Hard
842 将数组拆分成斐波那契序列 - Split Array into Fibonacci Sequence Medium
841 钥匙和房间 - Keys and Rooms Medium
840  矩阵中的幻方 - Magic Squares In Grid Easy
839 相似字符串组 - Similar String Groups Hard
838 推多米诺 - Push Dominoes Medium
837 新21点 - New 21 Game Medium
836 矩形重叠 - Rectangle Overlap Easy
835 图像重叠 - Image Overlap Medium
834 树中距离之和 - Sum of Distances in Tree Hard
833 字符串中的查找与替换 - Find And Replace in String Medium
832 翻转图像 - Flipping an Image Easy
831 隐藏个人信息 - Masking Personal Information Medium
830 较大分组的位置 - Positions of Large Groups Easy
829 连续整数求和 - Consecutive Numbers Sum Hard
828 独特字符串 - Unique Letter String Hard
827 最大人工岛 - Making A Large Island Hard
826 安排工作以达到最大收益 - Most Profit Assigning Work Medium
825 适龄的朋友 - Friends Of Appropriate Ages Medium
824 山羊拉丁文 - Goat Latin Easy
823 带因子的二叉树 - Binary Trees With Factors Medium
822 翻转卡片游戏 - Card Flipping Game Medium
821 字符的最短距离 - Shortest Distance to a Character Easy
820 单词的压缩编码 - Short Encoding of Words Medium
819 最常见的单词 - Most Common Word Easy
818 赛车 - Race Car Hard
817 链表组件 - Linked List Components Medium
816 模糊坐标 - Ambiguous Coordinates Medium
815 公交路线 - Bus Routes Hard
814 二叉树剪枝 - Binary Tree Pruning Medium
813 最大平均值和的分组 - Largest Sum of Averages Medium
812 最大三角形面积 - Largest Triangle Area Easy
811 子域名访问计数 - Subdomain Visit Count Easy
810 黑板异或游戏 - Chalkboard XOR Game Hard
809 情感丰富的文字 - Expressive Words Medium
808 分汤 - Soup Servings Medium
807 保持城市天际线 - Max Increase to Keep City Skyline Medium
806 写字符串需要的行数 - Number of Lines To Write String Easy
805 数组的均值分割 - Split Array With Same Average Hard
804 唯一摩尔斯密码词 - Unique Morse Code Words Easy
803 打砖块 - Bricks Falling When Hit Hard
802 找到最终的安全状态 - Find Eventual Safe States Medium
801 使序列递增的最小交换次数 - Minimum Swaps To Make Sequences Increasing Medium
800 Easy
799 香槟塔 - Champagne Tower Medium
798 得分最高的最小轮调 - Smallest Rotation with Highest Score Hard
797 所有可能的路径 - All Paths From Source to Target Medium
796 旋转字符串 - Rotate String Easy
795 区间子数组个数 - Number of Subarrays with Bounded Maximum Medium
794 有效的井字游戏 - Valid Tic-Tac-Toe State Medium
793 阶乘函数后K个零 - Preimage Size of Factorial Zeroes Function Hard
792 匹配子序列的单词数 - Number of Matching Subsequences Medium
791 自定义字符串排序 - Custom Sort String Medium
790 多米诺和托米诺平铺 - Domino and Tromino Tiling Medium
789 逃脱阻碍者 - Escape The Ghosts Medium
788 旋转数字 - Rotated Digits Easy
787 K 站中转内最便宜的航班 - Cheapest Flights Within K Stops Medium
786 第 K 个最小的素数分数 - K-th Smallest Prime Fraction Hard
785 判断二分图 - Is Graph Bipartite? Medium
784 字母大小写全排列 - Letter Case Permutation Easy
783 二叉搜索树结点最小距离 - Minimum Distance Between BST Nodes Easy
782 变为棋盘 - Transform to Chessboard Hard
781 森林中的兔子 - Rabbits in Forest Medium
780 到达终点 - Reaching Points Hard
779 第K个语法符号 - K-th Symbol in Grammar Medium
778 水位上升的泳池中游泳 - Swim in Rising Water Hard
777 在LR字符串中交换相邻字符 - Swap Adjacent in LR String Medium
776 Medium
775 全局倒置与局部倒置 - Global and Local Inversions Medium
774 Hard
773 滑动谜题 - Sliding Puzzle Hard
772 Hard
771 宝石与石头 - Jewels and Stones Easy
770 基本计算器 IV - Basic Calculator IV Hard
769 最多能完成排序的块 - Max Chunks To Make Sorted Medium
768 最多能完成排序的块 II - Max Chunks To Make Sorted II Hard
767 重构字符串 - Reorganize String Medium
766 托普利茨矩阵 - Toeplitz Matrix Easy
765 情侣牵手 - Couples Holding Hands Hard
764 最大加号标志 - Largest Plus Sign Medium
763 划分字母区间 - Partition Labels Medium
762 二进制表示中质数个计算置位 - Prime Number of Set Bits in Binary Representation Easy
761 特殊的二进制序列 - Special Binary String Hard
760 Easy
759 Hard
758 Easy
757 设置交集大小至少为2 - Set Intersection Size At Least Two Hard
756 金字塔转换矩阵 - Pyramid Transition Matrix Medium
755 Medium
754 到达终点数字 - Reach a Number Easy
753 破解保险箱 - Cracking the Safe Hard
752 打开转盘锁 - Open the Lock Medium
751 Easy
750 Medium
749 隔离病毒 - Contain Virus Hard
748 最短完整词 - Shortest Completing Word Easy
747 至少是其他数字两倍的最大数 - Largest Number At Least Twice of Others Easy
746 使用最小花费爬楼梯 - Min Cost Climbing Stairs Easy
745 前缀和后缀搜索 - Prefix and Suffix Search Hard
744 寻找比目标字母大的最小字母 - Find Smallest Letter Greater Than Target Easy
743 网络延迟时间 - Network Delay Time Medium
742 Medium
741 摘樱桃 - Cherry Pickup Hard
740 删除与获得点数 - Delete and Earn Medium
739 每日温度 - Daily Temperatures Medium
738 单调递增的数字 - Monotone Increasing Digits Medium
737 Medium
736 Lisp 语法解析 - Parse Lisp Expression Medium
735 行星碰撞 - Asteroid Collision Medium
734 Easy
733 图像渲染 - Flood Fill Easy
732 我的日程安排表 III - My Calendar III Hard
731 我的日程安排表 II - My Calendar II Medium
730 统计不同回文子字符串 - Count Different Palindromic Subsequences Hard
729 我的日程安排表 I - My Calendar I Medium
728 自除数 - Self Dividing Numbers Easy
727 Hard
726 原子的数量 - Number of Atoms Hard
725 分隔链表 - Split Linked List in Parts Medium
724 寻找数组的中心索引 - Find Pivot Index Easy
723 Medium
722 删除注释 - Remove Comments Medium
721 账户合并 - Accounts Merge Medium
720 词典中最长的单词 - Longest Word in Dictionary Easy
719 找出第 k 小的距离对 - Find K-th Smallest Pair Distance Hard
718 最长重复子数组 - Maximum Length of Repeated Subarray Medium
717 1比特与2比特字符 - 1-bit and 2-bit Characters Easy
716 Easy
715 Range 模块 - Range Module Hard
714 买卖股票的最佳时机含手续费 - Best Time to Buy and Sell Stock with Transaction Fee Medium
713 乘积小于K的子数组 - Subarray Product Less Than K Medium
712 两个字符串的最小ASCII删除和 - Minimum ASCII Delete Sum for Two Strings Medium
711 Hard
710 黑名单中的随机数 - Random Pick with Blacklist Hard
709 转换成小写字母 - To Lower Case Easy
708 Medium
707 设计链表 - Design Linked List Easy
706 设计哈希映射 - Design HashMap Easy
705 设计哈希集合 - Design HashSet Easy
704 二分查找 - Binary Search Easy
703 数据流中的第K大元素 - Kth Largest Element in a Stream Easy
702 Medium
701 二叉搜索树中的插入操作 - Insert into a Binary Search Tree Medium
700 二叉搜索树中的搜索 - Search in a Binary Search Tree Easy
699 掉落的方块 - Falling Squares Hard
698 划分为k个相等的子集 - Partition to K Equal Sum Subsets Medium
697 数组的度 - Degree of an Array Easy
696 计数二进制子串 - Count Binary Substrings Easy
695 岛屿的最大面积 - Max Area of Island Medium
694 Medium
693 交替位二进制数 - Binary Number with Alternating Bits Easy
692 前K个高频单词 - Top K Frequent Words Medium
691 贴纸拼词 - Stickers to Spell Word Hard
690 员工的重要性 - Employee Importance Easy
689 三个无重叠子数组的最大和 - Maximum Sum of 3 Non-Overlapping Subarrays Hard
688 “马”在棋盘上的概率 - Knight Probability in Chessboard Medium
687 最长同值路径 - Longest Univalue Path Easy
686 重复叠加字符串匹配 - Repeated String Match Easy
685 冗余连接 II - Redundant Connection II Hard
684 冗余连接 - Redundant Connection Medium
683 Hard
682 棒球比赛 - Baseball Game Easy
681 Medium
680 验证回文字符串 Ⅱ - Valid Palindrome II Easy
679 24点游戏 - 24 Game Medium
678 有效的括号字符串 - Valid Parenthesis String Medium
677 键值映射 - Map Sum Pairs Medium
676 实现一个魔法字典 - Implement Magic Dictionary Medium
675 为高尔夫比赛砍树 - Cut Off Trees for Golf Event Hard
674 最长连续递增序列 - Longest Continuous Increasing Subsequence Easy
673 最长递增子序列的个数 - Number of Longest Increasing Subsequence Medium
672 灯泡开关 Ⅱ - Bulb Switcher II Medium
671 二叉树中第二小的节点 - Second Minimum Node In a Binary Tree Easy
670 最大交换 - Maximum Swap Medium
669 修剪二叉搜索树 - Trim a Binary Search Tree Easy
668 乘法表中第k小的数 - Kth Smallest Number in Multiplication Table Hard
667 优美的排列 II - Beautiful Arrangement II Medium
666 Medium
665 非递减数列 - Non-decreasing Array Medium
664 奇怪的打印机 - Strange Printer Medium
663 Medium
662 二叉树最大宽度 - Maximum Width of Binary Tree Medium
661 图片平滑器 - Image Smoother Easy
660 Hard
659 分割数组为连续子序列 - Split Array into Consecutive Subsequences Medium
658 找到 K 个最接近的元素 - Find K Closest Elements Medium
657 机器人能否返回原点 - Robot Return to Origin Easy
656 Hard
655 输出二叉树 - Print Binary Tree Medium
654 最大二叉树 - Maximum Binary Tree Medium
653 两数之和 IV - 输入 BST - Two Sum IV - Input is a BST Easy
652 寻找重复的子树 - Find Duplicate Subtrees Medium
651 Medium
650 只有两个键的键盘 - 2 Keys Keyboard Medium
649 Dota2 参议院 - Dota2 Senate Medium
648 单词替换 - Replace Words Medium
647 回文子串 - Palindromic Substrings Medium
646 最长数对链 - Maximum Length of Pair Chain Medium
645 错误的集合 - Set Mismatch Easy
644 Hard
643 子数组最大平均数 I - Maximum Average Subarray I Easy
642 Hard
641 设计循环双端队列 - Design Circular Deque Medium
640 求解方程 - Solve the Equation Medium
639 解码方法 2 - Decode Ways II Hard
638 大礼包 - Shopping Offers Medium
637 二叉树的层平均值 - Average of Levels in Binary Tree Easy
636 函数的独占时间 - Exclusive Time of Functions Medium
635 Medium
634 Medium
633 平方数之和 - Sum of Square Numbers Easy
632 最小区间 - Smallest Range Hard
631 Hard
630 课程表 III - Course Schedule III Hard
629 K个逆序对数组 - K Inverse Pairs Array Hard
628 三个数的最大乘积 - Maximum Product of Three Numbers Easy
627 交换工资 - Swap Salary Easy
626 换座位 - Exchange Seats Medium
625 Medium
624 Easy
623 在二叉树中增加一行 - Add One Row to Tree Medium
622 设计循环队列 - Design Circular Queue Medium
621 任务调度器 - Task Scheduler Medium
620 有趣的电影 - Not Boring Movies Easy
619 Easy
618 Hard
617 合并二叉树 - Merge Two Binary Trees Easy
616 Medium
615 Hard
614 Medium
613 Easy
612 Medium
611 有效三角形的个数 - Valid Triangle Number Medium
610 Easy
609 在系统中查找重复文件 - Find Duplicate File in System Medium
608 Medium
607 Easy
606 根据二叉树创建字符串 - Construct String from Binary Tree Easy
605 种花问题 - Can Place Flowers Easy
604 Easy
603 Easy
602 Medium
601 体育馆的人流量 - Human Traffic of Stadium Hard
600 不含连续1的非负整数 - Non-negative Integers without Consecutive Ones Hard
599 两个列表的最小索引总和 - Minimum Index Sum of Two Lists Easy
598 范围求和 II - Range Addition II Easy
597 Easy
596 超过5名学生的课 - Classes More Than 5 Students Easy
595 大的国家 - Big Countries Easy
594 最长和谐子序列 - Longest Harmonious Subsequence Easy
593 有效的正方形 - Valid Square Medium
592 分数加减运算 - Fraction Addition and Subtraction Medium
591 标签验证器 - Tag Validator Hard
590 Easy
589 Easy
588 Hard
587 安装栅栏 - Erect the Fence Hard
586 Easy
585 Medium
584 Easy
583 两个字符串的删除操作 - Delete Operation for Two Strings Medium
582 Medium
581 最短无序连续子数组 - Shortest Unsorted Continuous Subarray  Easy
580 Medium
579 Hard
578 Medium
577 员工奖金 - Employee Bonus Easy
576 出界的路径数 - Out of Boundary Paths Medium
575 分糖果 - Distribute Candies Easy
574 Medium
573 Medium
572 另一个树的子树 - Subtree of Another Tree Easy
571 Hard
570 Medium
569 Hard
568 Hard
567 字符串的排列 - Permutation in String Medium
566 重塑矩阵 - Reshape the Matrix Easy
565 数组嵌套 - Array Nesting Medium
564 寻找最近的回文数 - Find the Closest Palindrome Hard
563 二叉树的坡度 - Binary Tree Tilt Easy
562 Medium
561 数组拆分 I - Array Partition I Easy
560 和为K的子数组 - Subarray Sum Equals K Medium
559 Easy
558 Easy
557 反转字符串中的单词 III - Reverse Words in a String III Easy
556 下一个更大元素 III - Next Greater Element III Medium
555 Medium
554 砖墙 - Brick Wall Medium
553 最优除法 - Optimal Division Medium
552 学生出勤记录 II - Student Attendance Record II Hard
551 学生出勤纪录 I - Student Attendance Record I Easy
550 Medium
549 Medium
548 Medium
547 朋友圈 - Friend Circles Medium
546 移除盒子 - Remove Boxes Hard
545 Medium
544 Medium
543 二叉树的直径 - Diameter of Binary Tree Easy
542 01 矩阵 - 01 Matrix Medium
541 反转字符串 II - Reverse String II Easy
540 有序数组中的单一元素 - Single Element in a Sorted Array Medium
539 最小时间差 - Minimum Time Difference Medium
538 把二叉搜索树转换为累加树 - Convert BST to Greater Tree Easy
537 复数乘法 - Complex Number Multiplication Medium
536 Medium
535 Medium
534 Medium
533 Medium
532 数组中的K-diff数对 - K-diff Pairs in an Array Easy
531 Medium
530 二叉搜索树的最小绝对差 - Minimum Absolute Difference in BST Easy
529 扫雷游戏 - Minesweeper Medium
528 按权重随机选择 - Random Pick with Weight Medium
527 Hard
526 优美的排列 - Beautiful Arrangement Medium
525 连续数组 - Contiguous Array Medium
524 通过删除字母匹配到字典里最长单词 - Longest Word in Dictionary through Deleting Medium
523 连续的子数组和 - Continuous Subarray Sum Medium
522 最长特殊序列 II - Longest Uncommon Subsequence II Medium
521 最长特殊序列 Ⅰ - Longest Uncommon Subsequence I Easy
520 检测大写字母 - Detect Capital Easy
519 随机翻转矩阵 - Random Flip Matrix Medium
518 零钱兑换 II - Coin Change 2 Medium
517 超级洗衣机 - Super Washing Machines Hard
516 最长回文子序列 - Longest Palindromic  Medium
515 在每个树行中找最大值 - Find Largest Value in Each Tree Row Medium
514 自由之路 - Freedom Trail Hard
513 找树左下角的值 - Find Bottom Left Tree Value Medium
512 Medium
511 Medium
510 Medium
509 斐波那契数 - Fibonacci Number Easy
508 出现次数最多的子树元素和 - Most Frequent Subtree Sum Medium
507 完美数 - Perfect Number Easy
506 相对名次 - Relative Ranks Easy
505 Medium
504 七进制数 - Base 7 Easy
503 下一个更大元素 II - Next Greater Element II Medium
502 IPO(首次公开募股) - Initial Public Offerings Hard
501 二叉搜索树中的众数 - Find Mode in Binary Search Tree Easy
500 键盘行 - Keyboard Row Easy
499 Hard
498 对角线遍历 - Diagonal Traverse Medium
497 非重叠矩形中的随机点 - Random Point in Non-overlapping Rectangles Medium
496 下一个更大元素 I - Next Greater Element I Easy
495 提莫攻击 - Teemo Attacking Medium
494 目标和 - Target Sum Medium
493 翻转对 - Reverse Pairs Hard
492 构造矩形 - Construct the Rectangle Easy
491 递增子序列 - Increasing Subsequences Medium
490 Medium
489 Hard
488 祖玛游戏 - Zuma Game Hard
487 Medium
486 预测赢家 - Predict the Winner Medium
485 最大连续1的个数 - Max Consecutive Ones Easy
484 Medium
483 最小好进制 - Smallest Good Base Hard
482 密钥格式化 - License Key Formatting Easy
481 神奇字符串 - Magical String Medium
480 Hard
479 最大回文数乘积 - Largest Palindrome Product Hard
478 在圆内随机生成点 - Generate Random Point in a Circle Medium
477 汉明距离总和 - Total Hamming Distance Medium
476 数字的补数 - Number Complement Easy
475 供暖器 - Heaters Easy
474 一和零 - Ones and Zeroes Medium
473 火柴拼正方形 - Matchsticks to Square Medium
472 连接词 - Concatenated Words Hard
471 Hard
470 用 Rand7() 实现 Rand10() - Implement Rand10() Using Rand7() Medium
469 Medium
468 验证IP地址 - Validate IP Address Medium
467 环绕字符串中唯一的子字符串 - Unique Substrings in Wraparound String Medium
466 统计重复个数 - Count The Repetitions Hard
465 Hard
464 我能赢吗 - Can I Win Medium
463 岛屿的周长 - Island Perimeter Easy
462 最少移动次数使数组元素相等 II - Minimum Moves to Equal Array Elements II Medium
461 汉明距离 - Hamming Distance Easy
460 Hard
459 重复的子字符串 - Repeated Substring Pattern Easy
458 可怜的小猪 - Poor Pigs Hard
457 环形数组循环 - Circular Array Loop Medium
456 132模式 - 132 Pattern Medium
455 分发饼干 - Assign Cookies Easy
454 四数相加 II - 4Sum II Medium
453 最小移动次数使数组元素相等 - Minimum Moves to Equal Array Elements Easy
452 用最少数量的箭引爆气球 - Minimum Number of Arrows to Burst Balloons Medium
451 根据字符出现频率排序 - Sort Characters By Frequency Medium
450 删除二叉搜索树中的节点 - Delete Node in a BST Medium
449 Medium
448 找到所有数组中消失的数字 - Find All Numbers Disappeared in an Array Easy
447 回旋镖的数量 - Number of Boomerangs Easy
446 等差数列划分 II - 子序列 - Arithmetic Slices II - Subsequence Hard
445 两数相加 II - Add Two Numbers II Medium
444 Medium
443 压缩字符串 - String Compression Easy
442 数组中重复的数据 - Find All Duplicates in an Array Medium
441 排列硬币 - Arranging Coins Easy
440 字典序的第K小数字 - K-th Smallest in Lexicographical Order Hard
439 Medium
438 找到字符串中所有字母异位词 - Find All Anagrams in a String Easy
437 路径总和 III - Path Sum III Easy
436 寻找右区间 - Find Right Interval Medium
435 无重叠区间 - Non-overlapping Intervals Medium
434 字符串中的单词数 - Number of Segments in a String Easy
433 最小基因变化 - Minimum Genetic Mutation Medium
432 Hard
431 Hard
430 Medium
429 Easy
428 Hard
427 Easy
426 Medium
425 Hard
424 替换后的最长重复字符 - Longest Repeating Character Replacement Medium
423 从英文中重建数字 - Reconstruct Original Digits from English Medium
422 Easy
421 数组中两个数的最大异或值 - Maximum XOR of Two Numbers in an Array Medium
420 强密码检验器 - Strong Password Checker Hard
419 甲板上的战舰 - Battleships in a Board Medium
418 Medium
417 太平洋大西洋水流问题 - Pacific Atlantic Water Flow Medium
416 分割等和子集 - Partition Equal Subset Sum Medium
415 字符串相加 - Add Strings Easy
414 第三大的数 - Third Maximum Number Easy
413 等差数列划分 - Arithmetic Slices Medium
412  Fizz Buzz Easy
411 Hard
410 分割数组的最大值 - Split Array Largest Sum Hard
409 最长回文串 - Longest Palindrome Easy
408 Easy
407 接雨水 II - Trapping Rain Water II Hard
406 根据身高重建队列 - Queue Reconstruction by Height Medium
405 数字转换为十六进制数 - Convert a Number to Hexadecimal Easy
404 左叶子之和 - Sum of Left Leaves Easy
403 青蛙过河 - Frog Jump Hard
402 移掉K位数字 - Remove K Digits Medium
401 二进制手表 - Binary Watch Easy
400 第N个数字 - Nth Digit  Easy
399 除法求值 - Evaluate Division Medium
398 随机数索引 - Random Pick Index Medium
397 整数替换 - Integer Replacement Medium
396 旋转函数 - Rotate Function Medium
395 至少有K个重复字符的最长子串 - Longest Substring with At Least K Repeating Characters Medium
394 字符串解码 - Decode String Medium
393 UTF-8 编码验证 - UTF-8 Validation Medium
392 判断子序列 - Is Subsequence Medium
391 完美矩形 - Perfect Rectangle Hard
390 消除游戏 - Elimination Game Medium
389 找不同 - Find the Difference  Easy
388  文件的最长绝对路径 - Longest Absolute File Path Medium
387 字符串中的第一个唯一字符 - First Unique Character in a String Easy
386 字典序排数 - Lexicographical Numbers Medium
385 迷你语法分析器 - Mini Parser Medium
384 打乱数组 - Shuffle an Array Medium
383 赎金信 - Ransom Note Easy
382 链表随机节点 - Linked List Random Node Medium
381 O(1) 时间插入、删除和获取随机元素 - 允许重复 - Insert Delete GetRandom O(1) - Duplicates allowed Hard
380 常数时间插入、删除和获取随机元素 - Insert Delete GetRandom O(1) Medium
379 Medium
378 有序矩阵中第K小的元素 - Kth Smallest Element in a Sorted Matrix Medium
377 组合总和 Ⅳ - Combination Sum IV Medium
376 摆动序列 - Wiggle Subsequence Medium
375 猜数字大小 II - Guess Number Higher or Lower II Medium
374 猜数字大小 - Guess Number Higher or Lower Easy
373 查找和最小的K对数字 - Find K Pairs with Smallest Sums Medium
372 超级次方 - Super Pow Medium
371 两整数之和 - Sum of Two Integers  Easy
370 Medium
369 Medium
368 最大整除子集 - Largest Divisible Subset Medium
367 有效的完全平方数 - Valid Perfect Square Easy
366 Medium
365 水壶问题 - Water and Jug Problem Medium
364 Medium
363 矩形区域不超过 K 的最大数值和 - Max Sum of Rectangle No Larger Than K Hard
362 Medium
361 Medium
360 Medium
359 Easy
358 Hard
357 计算各个位数不同的数字个数 - Count Numbers with Unique Digits Medium
356 Medium
355 Medium
354 俄罗斯套娃信封问题 - Russian Doll Envelopes Hard
353 Medium
352 将数据流变为多个不相交间隔 - Data Stream as Disjoint Intervals Hard
351 Medium
350 两个数组的交集 II - Intersection of Two Arrays II Easy
349 两个数组的交集 - Intersection of Two Arrays Easy
348 Medium
347 Medium
346 Easy
345 反转字符串中的元音字母 - Reverse Vowels of a String Easy
344 反转字符串 - Reverse String Easy
343 整数拆分 - Integer Break Medium
342 4的幂 - Power of Four Easy
341 Medium
340 Hard
339 Easy
338 比特位计数 - Counting Bits Medium
337 打家劫舍 III - House Robber III Medium
336 回文对 - Palindrome Pairs Hard
335 路径交叉 - Self Crossing Hard
334 递增的三元子序列 - Increasing Triplet Subsequence Medium
333 Medium
332 重新安排行程 - Reconstruct Itinerary Medium
331 验证二叉树的前序序列化 - Verify Preorder Serialization of a Binary Tree Medium
330 Hard
329 矩阵中的最长递增路径 - Longest Increasing Path in a Matrix Hard
328 奇偶链表 - Odd Even Linked List Medium
327 区间和的个数 - Count of Range Sum Hard
326 3的幂 - Power of Three Easy
325 Medium
324 摆动排序 II - Wiggle Sort II Medium
323 Medium
322 零钱兑换 - Coin Change Medium
321 拼接最大数 - Create Maximum Number Hard
320 Medium
319 灯泡开关 - Bulb Switcher Medium
318 最大单词长度乘积 - Maximum Product of Word Lengths Medium
317 Hard
316 去除重复字母 - Remove Duplicate Letters Hard
315 计算右侧小于当前元素的个数 - Count of Smaller Numbers After Self Hard
314 Medium
313 超级丑数 - Super Ugly Number Medium
312 戳气球 - Burst Balloons Hard
311 Medium
310 最小高度树 - Minimum Height Trees Medium
309 最佳买卖股票时机含冷冻期 - Best Time to Buy and Sell Stock with Cooldown Medium
308 Hard
307 区域和检索 - 数组可修改 - Range Sum Query - Mutable Medium
306 累加数 - Additive Number Medium
305 Hard
304 二维区域和检索 - 矩阵不可变 - Range Sum Query 2D - Immutable Medium
303 区域和检索 - 数组不可变 - Range Sum Query - Immutable Easy
302 Hard
301 删除无效的括号 - Remove Invalid Parentheses Hard
300 最长上升子序列 - Longest Increasing Subsequence Medium
299 猜数字游戏 - Bulls and Cows Medium
298 Medium
297 Hard
296 Hard
295 数据流的中位数 - Find Median from Data Stream Hard
294 Medium
293 Easy
292 Nim游戏 - Nim Game Easy
291 Hard
290 单词模式 - Word Pattern  Easy
289 生命游戏 - Game of Life Medium
288 Medium
287  寻找重复数 - Find the Duplicate Number Medium
286 墙和门 $ Walls and Gates Medium
285 二叉搜索树中的中序后继节点 $ Inorder Successor in BST Medium
284 Medium
283 移动零 - Move Zeroes Easy
282 给表达式添加运算符 - Expression Add Operators Hard
281 之字形迭代器 $ Zigzag Iterator Medium
280 摆动排序 $ Wiggle Sort Medium
279 完全平方数 - Perfect Squares Medium
278 第一个错误的版本 - First Bad Version Easy
277 寻找名人 $ Find the Celebrity Medium
276 粉刷栅栏 $ Paint Fence Easy
275 H指数 II - H-Index II Medium
274 H指数 - H-Index Medium
273 整数转换英文表示 - Integer to English Words Hard
272 最近的二分搜索树的值 II $ Closest Binary Search Tree Value II Hard
271 加码解码字符串 $ Encode and Decode Strings Medium
270 最近的二分搜索树的值 $ Closest Binary Search Tree Value Easy
269 外星人词典 $ Alien Dictionary Hard
268 缺失数字 - Missing Number Easy
267 回文全排列 II $ Palindrome Permutation II Medium
266 回文全排列 $ Palindrome Permutation Easy
265 粉刷房子 II $ Paint House II Hard
264 丑数 II - Ugly Number II Medium
263 丑数 - Ugly Number Easy
262 行程和用户 - Trips and Users Hard
261 图验证树 $ Graph Valid Tree Medium
260 只出现一次的数字 III - Single Number III Medium
259 三数之和较小值 $ 3Sum Smaller Medium
258 各位相加 - Add Digits Easy
257 二叉树的所有路径 - Binary Tree Paths Easy
256 粉刷房子 $ Paint House Easy
255 验证二叉搜索树的先序序列 $ Verify Preorder Sequence in Binary Search Tree Medium
254 因子组合 $ Factor Combinations Medium
253 会议室 II $ Meeting Rooms II Medium
252 会议室 $ Meeting Rooms Easy
251 展平二维向量 $ Flatten 2D Vector Medium
250 计数相同值子树的个数 $ Count Univalue Subtrees Medium
249 群组偏移字符串 $ Group Shifted Strings Medium
248  对称数 III $ Strobogrammatic Number III Hard
247 对称数 II $ Strobogrammatic Number II Medium
246 对称数 $ Strobogrammatic Number Easy
245 最短单词距离 III $ Shortest Word Distance III Medium
244 最短单词距离 II $ Shortest Word Distance II Medium
243 最短单词距离 $ Shortest Word Distance Easy
242 有效的字母异位词 - Valid Anagram Easy
241 为运算表达式设计优先级 - Different Ways to Add Parentheses Medium
240 搜索二维矩阵 II - Search a 2D Matrix II Medium
239 滑动窗口最大值 - Sliding Window Maximum Hard
238 除自身以外数组的乘积 - Product of Array Except Self Medium
237 删除链表中的节点 - Delete Node in a Linked List Easy
236 二叉树的最近公共祖先 - Lowest Common Ancestor of a Binary Tree Medium
235 二叉搜索树的最近公共祖先 - Lowest Common Ancestor of a Binary Search Tree Easy
234 回文链表 - Palindrome Linked List Easy
233 数字1的个数 - Number of Digit One Hard
232 用栈实现队列 - Implement Queue using Stacks Easy
231 2的幂 - Power of Two Easy
230 二叉搜索树中第K小的元素 - Kth Smallest Element in a BST Medium
229 求众数 II - Majority Element II Medium
228 汇总区间 - Summary Ranges Medium
227 基本计算器 II - Basic Calculator II Medium
226 翻转二叉树 - Invert Binary Tree Easy
225 用队列实现栈 - Implement Stack using Queues Easy
224 基本计算器 - Basic Calculator Hard
223 矩形面积 - Rectangle Area Medium
222 完全二叉树的节点个数 - Count Complete Tree Nodes Medium
221 最大正方形 - Maximal Square Medium
220 存在重复元素 III - Contains Duplicate III Medium
219 存在重复元素 II - Contains Duplicate II Easy
218 天际线问题 - The Skyline Problem Hard
217 存在重复元素 - Contains Duplicate Easy
216 组合总和 III - Combination Sum III Medium
215 数组中的第K个最大元素 - Kth Largest Element in an Array Medium
214 最短回文串 - Shortest Palindrome Hard
213 打家劫舍 II - House Robber II Medium
212 单词搜索 II - Word Search II Hard
211 添加与搜索单词 - 数据结构设计 - Add and Search Word - Data structure design Medium
210 课程表 II - Course Schedule II Medium
209 长度最小的子数组 - Minimum Size Subarray Sum Medium
208 实现 Trie (前缀树) - Implement Trie (Prefix Tree) Medium
207 课程表 - Course Schedule Medium
206 反转链表 - Reverse Linked List Easy
205 同构字符串 - Isomorphic Strings Easy
204 计数质数 - Count Primes Easy
203 移除链表元素 - Remove Linked List Elements Easy
202 快乐数 - Happy Number Easy
201 数字范围按位与 - Bitwise AND of Numbers Range Medium
200 岛屿的个数 - Number of Islands Medium
199 二叉树的右视图 - Binary Tree Right Side View Medium
198 打家劫舍 - House Robber Easy
197 上升的温度 - Rising Temperature Easy
196 删除重复的电子邮箱 - Delete Duplicate Emails Easy
195 第十行 - Tenth Line Easy
194 转置文件 - Transpose File Medium
193 有效电话号码 - Valid Phone Numbers Easy
192 统计词频 - Word Frequency  Medium
191 位1的个数 - Number of 1 Bits Easy
190 颠倒二进制位 - Reverse Bits Easy
189 旋转数组 - Rotate Array Easy
188 买卖股票的最佳时机 IV - Best Time to Buy and Sell Stock IV Hard
187 重复的DNA序列 - Repeated DNA Sequences Medium
186 翻转字符串中的单词 II $ Reverse Words in a String II Medium
185 部门工资前三高的员工 - Department Top Three Salaries Hard
184 部门工资最高的员工 - Department Highest Salary Medium
183 从不订购的客户 - Customers Who Never Order Easy
182 查找重复的电子邮箱 - Duplicate Emails Easy
181 超过经理收入的员工 - Employees Earning More Than Their Managers Easy
180 连续出现的数字 - Consecutive Numbers Medium
179 最大数 - Largest Number Medium
178 分数排名 - Rank Scores Medium
177 第N高的薪水 - Nth Highest Salary  Medium
176 第二高的薪水 - Second Highest Salary Easy
175 组合两个表 - Combine Two Tables Easy
174 地下城游戏 - Dungeon Game Hard
173 二叉搜索树迭代器 - Binary Search Tree Iterator Medium
172 阶乘后的零 - Factorial Trailing Zeroes Easy
171 Excel表列序号 - Excel Sheet Column Number Easy
170 两数之和之三 - 数据结构设计 $ Two Sum III - Data structure design Easy
169 求众数 - Majority Element Easy
168 Excel表列名称 - Excel Sheet Column Title Easy
167 两数之和 II - 输入有序数组 - Two Sum II - Input array is sorted Easy
166 分数到小数 - Fraction to Recurring Decimal Medium
165 比较版本号 - Compare Version Numbers Medium
164 最大间距 - Maximum Gap Hard
163 缺失区间 $ Missing Ranges Medium
162 寻找峰值 - Find Peak Element Medium
161 一次编辑距离 $ One Edit Distance Medium
160 相交链表 - Intersection of Two Linked Lists Easy
159 具有最多两个不同字符的最长子串 $ Longest Substring with At Most Two Distinct Characters Hard
158 用Read4来读取N个字符II $ Read N Characters Given Read4 II Hard
157 用Read4来读取N个字符 $ Read N Characters Given Read4 Easy
156 二叉树的上下颠倒 $ Binary Tree Upside Down Medium
155 最小栈 - Min Stack  Easy
154 寻找旋转排序数组中的最小值 II - Find Minimum in Rotated Sorted Array II Hard
153 寻找旋转排序数组中的最小值 - Find Minimum in Rotated Sorted Array Medium
152 乘积最大子序列 - Maximum Product Subarray Medium
151 翻转字符串里的单词 - Reverse Words in a String Medium
150 逆波兰表达式求值 - Evaluate Reverse Polish Notation Medium
149 直线上最多的点数 - Max Points on a Line Hard
148 排序链表 - Sort List Medium
147 对链表进行插入排序 - Insertion Sort List Medium
146 LRU缓存机制 - LRU Cache Hard
145 二叉树的后序遍历 - Binary Tree Postorder Traversal Hard
144 二叉树的前序遍历 - Binary Tree Preorder Traversal Medium
143 重排链表 - Reorder List Medium
142 环形链表 II - Linked List Cycle II Medium
141 环形链表 - Linked List Cycle Easy
140 单词拆分 II - Word Break II Hard
139 单词拆分 - Word Break Medium
138 复制带随机指针的链表 - Copy List with Random Pointer Medium
137 只出现一次的数字 II - Single Number II Medium
136 只出现一次的数字 - Single Number Easy
135 分发糖果 - Candy Hard
134 加油站 - Gas Station Medium
133 克隆图 - Clone Graph Medium
132 分割回文串 II - Palindrome Partitioning II Hard
131 分割回文串 - Palindrome Partitioning Medium
130 被围绕的区域 - Surrounded Regions Medium
129 求根到叶子节点数字之和 - Sum Root to Leaf Numbers Medium
128 最长连续序列 - Longest Consecutive Sequence Hard
127 单词接龙 - Word Ladder Medium
126 单词接龙 II - Word Ladder II Hard
125 验证回文串 - Valid Palindrome Easy
124 二叉树中的最大路径和 - Binary Tree Maximum Path Sum Hard
123 买卖股票的最佳时机 III - Best Time to Buy and Sell Stock III Hard
122 买卖股票的最佳时机 II - Best Time to Buy and Sell Stock II Easy
121 买卖股票的最佳时机 I - Best Time to Buy and Sell Stock Easy
120 三角形最小路径和 - Triangle Medium
119 杨辉三角 II - Pascal's Triangle II Easy
118 杨辉三角 - Pascal's Triangle Easy
117 填充同一层的兄弟节点 II - Populating Next Right Pointers in Each Node II  Medium
116 填充同一层的兄弟节点 - Populating Next Right Pointers in Each Node Medium
115 不同的子序列 - Distinct Subsequences Hard
114 二叉树展开为链表 - Flatten Binary Tree to Linked List Medium
113 路径总和 II - Path Sum II Medium
112  路径总和 - Path Sum Easy
111 二叉树的最小深度 - Minimum Depth of Binary Tree Easy
110 平衡二叉树 - Balanced Binary Tree Easy
109 有序链表转换二叉搜索树 - Convert Sorted List to Binary Search Tree Medium
108 将有序数组转换为二叉搜索树 - Convert Sorted Array to Binary Search Tree Easy
107 二叉树的层次遍历 II - Binary Tree Level Order Traversal II Easy
106 从中序与后序遍历序列构造二叉树 - Construct Binary Tree from Inorder and Postorder Traversal Medium
105 从前序与中序遍历序列构造二叉树 - Construct Binary Tree from Preorder and Inorder Traversal Medium
104 二叉树的最大深度 - Maximum Depth of Binary Tree Easy
103 二叉树的锯齿形层次遍历 - Binary Tree Zigzag Level Order Traversal Medium
102 二叉树的层次遍历 - Binary Tree Level Order Traversal Medium
101 对称二叉树 - Symmetric Tree Easy
100 相同的树 - Same Tree Hard
99 恢复二叉搜索树 - Recover Binary Search Tree Medium
98 验证二叉搜索树 - Validate Binary Search Tree Medium
97 交错字符串 - Interleaving String Medium
96 不同的二叉搜索树 - Unique Binary Search Trees Medium
95 不同的二叉搜索树 II - Unique Binary Search Trees II Medium
94 二叉树的中序遍历 - Binary Tree Inorder Traversal Medium
93 复原IP地址 - Restore IP Addresses Medium
92 反转链表 II - Reverse Linked List II Medium
91 解码方法 - Decode Ways Medium
90 子集 II - Subsets II Medium
89 格雷编码 - Gray Code Medium
88 合并两个有序数组 - Merge Sorted Array Easy
87 扰乱字符串 - Scramble String Hard
86 分隔链表 - Partition List Medium
85 最大矩形 - Maximal Rectangle Hard
84 柱状图中最大的矩形 - Largest Rectangle in Histogram Hard
83 删除排序链表中的重复元素 - Remove Duplicates from Sorted List Easy
82 删除排序链表中的重复元素 II - Remove Duplicates from Sorted List II Medium
81 搜索旋转排序数组 II - Search in Rotated Sorted Array II Medium
80 删除排序数组中的重复项 II - Remove Duplicates from Sorted Array II Medium
79 单词搜索 - Word Search Medium
78 子集 - Subsets Medium
77 组合 - Combinations  Medium
76 最小覆盖子串 - Minimum Window Substring Hard
75 颜色分类 - Sort Colors Medium
74 搜索二维矩阵 - Search a 2D Matrix Medium
73 矩阵置零 - Set Matrix Zeroes Medium
72 编辑距离 - Edit Distance Hard
71 简化路径 - Simplify Path Medium
70 爬楼梯 - Climbing Stairs Easy
69 x 的平方根 - Sqrt(x) Easy
68 文本左右对齐 - Text Justification Hard
67 二进制求和 - Add Binary Easy
66 加一 - Plus One Easy
65 有效数字 - Valid Number Hard
64 最小路径和 - Minimum Path Sum Medium
63 不同路径 II - Unique Paths II Medium
62 不同路径 - Unique Paths Medium
61 旋转链表 - Rotate List Medium
60 第k个排列 - Permutation Sequence Medium
59 螺旋矩阵 II - Spiral Matrix II Medium
58 最后一个单词的长度 - Length of Last Word Easy
57 插入区间 - Insert Interval Hard
56 合并区间 - Merge Intervals Medium
55 跳跃游戏 - Jump Game Medium
54 螺旋矩阵 - Spiral Matrix Medium
53 最大子序和 - Maximum Subarray Easy
52 N皇后 II - N-Queens II Hard
51 N皇后 - N-Queens Hard
50 Pow(x, n) - Pow(x, n) Medium
49 字母异位词分组 - Group Anagrams Medium
48 旋转图像 - Rotate Image Medium
47 全排列 II - Permutations II Medium
46 全排列 - Permutations Medium
45 跳跃游戏 II - Jump Game II Hard
44 通配符匹配 - Wildcard Matching Hard
43 字符串相乘 - Multiply Strings Medium
42 接雨水 - Trapping Rain Water Hard
41 缺失的第一个正数 - First Missing Positive Hard
40 组合总和 II - Combination Sum II Medium
39 组合总和 - Combination Sum Medium
38 报数 - Count and Say Easy
37 解数独 - Sudoku Solver Hard
36 有效的数独 - Valid Sudoku Medium
35 搜索插入位置 - Search Insert Position Easy
34 在排序数组中查找元素的第一个和最后一个位置 - Find First and Last Position of Element in Sorted Array Medium
33 搜索旋转排序数组 - Search in Rotated Sorted Array Medium
32 最长有效括号 - Longest Valid Parentheses Hard
31 下一个排列 - Next Permutation Medium
30 与所有单词相关联的字串 - Substring with Concatenation of All Words Hard
29 两数相除 - Divide Two Integers Medium
28 实现strStr() - Implement strStr()  Easy
27 移除元素 - Remove Element  Easy
26 删除排序数组中的重复项 - Remove Duplicates from Sorted Array Easy
25 k个一组翻转链表 - Reverse Nodes in k-Group Hard
24 两两交换链表中的节点 - Swap Nodes in Pairs Medium
23 合并K个排序链表 - Merge k Sorted Lists Hard
22 括号生成 - Generate Parentheses Medium 
21 合并两个有序链表 - Merge Two Sorted Lists Easy
20 有效的括号 - Valid Parentheses Easy
19 删除链表的倒数第N个节点 - Remove Nth Node From End of List Medium
18 四数之和 - 4Sum Medium
17 电话号码的字母组合 - Letter Combinations of a Phone Number Medium
16 最接近的三数之和 - 3Sum Closest Medium
15 三数之和 - 3Sum Medium
14 最长公共前缀 - Longest Common Prefix Easy
13 罗马数字转整数 - Roman to Integer Easy
12 整数转罗马数字 - Integer to Roman Medium
11 盛最多水的容器 - Container With Most Water Medium
10 正则表达式匹配 - Regular Expression Matching Hard
9 回文数 - Palindrome Number Easy
8 字符串转整数 (atoi) - String to Integer (atoi) Medium
7 反转整数 - Reverse Integer Easy
6 Z字形变换 - ZigZag Conversion Medium
5 最长回文子串 - Longest Palindromic Substring Medium
4 两个排序数组的中位数 - Median of Two Sorted Arrays Hard
3 无重复字符的最长子串 - Longest Substring Without Repeating Characters Medium
2 两数相加 - Add Two Numbers Medium
1 两数之和 - Two Sum Easy

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LeetCode Solution by Swift

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