[ PS ] : Word Break

Author: uraflower

word-break/uraflower.js

@@ -0,0 +1,30 @@
+/**
+ * @param {string} s
+ * @param {string[]} wordDict
+ * @return {boolean}
+ */
+const wordBreak = function (s, wordDict) {
+    const dp = Array(s.length);
+    const dict = new Set(wordDict);
+
+    function recurse(start) {
+        if (start === s.length) return true;
+        if (dp[start] !== undefined) return dp[start];
+
+        for (let end = start + 1; end <= s.length; end++) {
+            const substr = s.slice(start, end);
+            if (dict.has(substr) && recurse(end)) {
+                dp[start] = true;
+                return true;
+            }
+        }
+
+        dp[start] = false;
+        return false;
+    }
+
+    return recurse(0);
+};
+
+// 시간복잡도: O(n^2) (n: s.length. n번 재귀 & 최대 n번 슬라이싱)
+// 공간복잡도: O(n + m) (m: wordDict.length)