Feat: 139. Word Break

Author: HC-kang

word-break/HC-kang.ts

@@ -0,0 +1,23 @@
+/**
+ * https://leetcode.com/problems/word-break
+ * T.C. O(s^2)
+ * S.C. O(s + w)
+ */
+function wordBreak(s: string, wordDict: string[]): boolean {
+  const wordSet = new Set(wordDict);
+
+  const dp = new Array(s.length + 1).fill(false);
+  dp[0] = true;
+
+  for (let i = 1; i <= s.length; i++) {
+    for (let j = 0; j < i; j++) {
+      if (!dp[j]) continue;
+      if (j-i > 20) break;
+      if (wordSet.has(s.slice(j, i))) {
+        dp[i] = true;
+        break;
+      }
+    }
+  }
+  return dp[s.length];
+}