139

Author: safrannn

README.md

@@ -2,7 +2,7 @@
 ### leetcode practise solutions in RUST
 
 ### current status
-176/1552 completed
+177/1552 completed
 
 ### Finished problems:
 |id|Solution| 
@@ -49,6 +49,7 @@
 |134|[Gas Station](src/_0134_gas_station.rs)|
 |135|[Candy](src/_0135_candy.rs)|
 |136|[Single Number](src/_0136_single_number.rs)|
+|139|[Word Break](src/_0139_word_break.rs)|
 |151|[Reverse Words in a String](src/_0151_reverse_words_in_a_string.rs)|
 |155|[Min Stack](src/_0155_min_stack.rs)|
 |167|[Two Sum II - Input array is sorted](src/_0167_two_sum_ii.rs)|

src/_0139_word_break.rs

@@ -0,0 +1,51 @@
+struct Solution;
+use std::collections::HashSet;
+
+impl Solution {
+    pub fn word_break(s: String, word_dict: Vec<String>) -> bool {
+        let word_dictionary: HashSet<String> = word_dict.into_iter().collect();
+        let mut dp: Vec<bool> = vec![false; s.len() + 1];
+        dp[0] = true;
+
+        for i in 1..=s.len() {
+            for j in 0..i {
+                if dp[j] && word_dictionary.contains(&s[j..i]) {
+                    dp[i] = true;
+                    break;
+                }
+            }
+        }
+        return dp[s.len()];
+    }
+}
+
+#[test]
+fn test() {
+    assert_eq!(
+        Solution::word_break(
+            "leetcode".to_string(),
+            vec!["leet".to_string(), "code".to_string()]
+        ),
+        true
+    );
+    assert_eq!(
+        Solution::word_break(
+            "catsandog".to_string(),
+            vec![
+                "cats".to_string(),
+                "dog".to_string(),
+                "sand".to_string(),
+                "and".to_string(),
+                "cat".to_string()
+            ]
+        ),
+        false
+    );
+    assert_eq!(
+        Solution::word_break(
+            "applepenapple".to_string(),
+            vec!["apple".to_string(), "pen".to_string()]
+        ),
+        true
+    );
+}

src/lib.rs

@@ -96,6 +96,8 @@ mod _0135_candy;
 //
 mod _0136_single_number;
 //
+mod _0139_word_break;
+//
 mod _0151_reverse_words_in_a_string;
 //
 mod _0155_min_stack;