[2025-05-02] gwangseok #471

BaekJoon/1509/gwangseok.py

@@ -0,0 +1,36 @@
+import sys
+read_line = sys.stdin.readline
+
+
+def update_is_palindrome(text, is_palindrome):
+    is_palindrome[0][0] = True
+
+    for idx in range(1, len(text)):
+        is_palindrome[idx][idx] = True
+        if text[idx-1] == text[idx]:
+            is_palindrome[idx-1][idx] = True
+
+    for length in range(2, len(text)):
+        for idx in range(len(text) - length):
+            if text[idx] == text[idx+length] and is_palindrome[idx+1][idx+length-1]:
+                is_palindrome[idx][idx+length] = True
+
+
+def update_dp(dp, is_palindrome, txt, start_idx):
+    for idx in range(len(txt) - 1, start_idx, -1):
+        if is_palindrome[start_idx][idx]:
+            dp[idx] = min(dp[idx], dp[start_idx-1] + 1)
+
+    dp[start_idx] = min(dp[start_idx], dp[start_idx - 1] + 1)
+
+
+text = read_line().strip()
+dp = [2500] * len(text) + [0]
+is_palindrome = [[False] * len(text) for _ in range(len(text))]
+
+update_is_palindrome(text, is_palindrome)
+
+for i in range(len(text)):
+    update_dp(dp, is_palindrome, text, i)
+
+print(dp[len(text) - 1])