1832. Check if the Sentence Is Pangram: AC

src/solution/mod.rs

@@ -1380,3 +1380,4 @@ mod s1827_minimum_operations_to_make_the_array_increasing;
 mod s1828_queries_on_number_of_points_inside_a_circle;
 mod s1829_maximum_xor_for_each_query;
 mod s1830_minimum_number_of_operations_to_make_string_sorted;
+mod s1832_check_if_the_sentence_is_pangram;

src/solution/s1832_check_if_the_sentence_is_pangram.rs

@@ -0,0 +1,69 @@
+/**
+ * [1832] Check if the Sentence Is Pangram
+ *
+ * A pangram is a sentence where every letter of the English alphabet appears at least once.
+ * Given a string sentence containing only lowercase English letters, return true if sentence is a pangram, or false otherwise.
+ *  
+ * Example 1:
+ *
+ * Input: sentence = "thequickbrownfoxjumpsoverthelazydog"
+ * Output: true
+ * Explanation: sentence contains at least one of every letter of the English alphabet.
+ *
+ * Example 2:
+ *
+ * Input: sentence = "leetcode"
+ * Output: false
+ *
+ *  
+ * Constraints:
+ *
+ * 	1 <= sentence.length <= 1000
+ * 	sentence consists of lowercase English letters.
+ *
+ */
+pub struct Solution {}
+
+// problem: https://leetcode.com/problems/check-if-the-sentence-is-pangram/
+// discuss: https://leetcode.com/problems/check-if-the-sentence-is-pangram/discuss/?currentPage=1&orderBy=most_votes&query=
+
+// submission codes start here
+
+const N_LETTERS: usize = (b'z' - b'a' + 1) as _;
+
+impl Solution {
+    pub fn check_if_pangram(sentence: String) -> bool {
+        sentence
+            .bytes()
+            .scan(0_u32, |bitset, b| {
+                *bitset |= 1 << (b - b'a');
+                Some(*bitset)
+            })
+            .any(|bitset| bitset == (1 << N_LETTERS) - 1)
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1832_example_1() {
+        let sentence = "thequickbrownfoxjumpsoverthelazydog".to_string();
+
+        let result = true;
+
+        assert_eq!(Solution::check_if_pangram(sentence), result);
+    }
+
+    #[test]
+    fn test_1832_example_2() {
+        let sentence = "leetcode".to_string();
+
+        let result = false;
+
+        assert_eq!(Solution::check_if_pangram(sentence), result);
+    }
+}