add: #271 Word Break

Author: sukyoungshin

word-break/sukyoungshin.ts

@@ -0,0 +1,23 @@
+function wordBreak(s: string, wordDict: string[]): boolean {
+  const cache: Record<string, boolean> = {};
+
+  function canSplit(str: string): boolean {
+    if (str === "") return true;
+    if (cache[str] !== undefined) return cache[str];
+
+    for (let i = 1; i <= str.length; i++) {
+      const left = str.slice(0, i);
+      const right = str.slice(i);
+
+      if (wordDict.includes(left) && canSplit(right)) {
+        cache[str] = true;
+        return true;
+      }
+    }
+
+    cache[str] = false;
+    return false;
+  }
+
+  return canSplit(s);
+};