tried word-break.

Author: sangbeenmoon

word-break/sangbeenmoon.py

@@ -0,0 +1,29 @@
+# 실패한 풀이.
+# AC 를 받기는 했으나 test case 가 좀 더 촘촘했다면 TLE 에 걸렸을 것임.
+# string 이 아닌 index 로 memoization 을 하는 걸 떠올려보자.
+
+class Solution:
+    answer = False
+    visited = {}
+    def wordBreak(self, s: str, wordDict: List[str]) -> bool:
+        
+        self.answer = False
+        self.visited = {}
+        self.go(0,s,wordDict)
+
+        return self.answer
+
+    def go(self, i:int, s: str, wordDict: List[str]):
+        if i >= (len(s)):
+            self.answer = True
+            return
+        
+        for word in wordDict:
+            if i + len(word) > len(s):
+                continue
+
+            if word == s[i:i + len(word)]:
+                if not s[i + len(word) : ] in self.visited:
+                    self.go(i + len(word), s, wordDict)
+        
+        self.visited[s[i:]] = False