139. Word Break (java)

Author: bluesword12350

solution/0139.Word Break/Solution.java

@@ -0,0 +1,21 @@
+class Solution {
+    public boolean wordBreak(String s, List<String> wordDict) {
+        int wordMaxLen = Integer.MIN_VALUE;
+        for (String word : wordDict){
+            wordMaxLen = Math.max(wordMaxLen, word.length());
+        }
+        Set<String> wordSet = new HashSet<>(wordDict);
+        int len = s.length();
+        boolean[] dp = new boolean[len + 1];
+        dp[0] = true;
+        for(int i = 1; i <= len; i++){
+            for(int l = 1; l <= wordMaxLen && i - l >= 0; l++){
+                if(dp[i-l] && wordSet.contains(s.substring(i-l, i))){
+                    dp[i] = true;
+                    break;
+                }
+            }
+        }
+        return dp[len];
+    }
+}