Merge pull request #1557 from AlgorithmWithGod/0224LJH

[20251201] PGM / LV2 / 올바른 괄호 / 이종환

Author: ShinHeeEul

0224LJH/202512/01 PGM 올바른 괄호.md

@@ -0,0 +1,21 @@
+```java
+import java.io.*;
+import java.util.*; 
+
+class Solution {
+    boolean solution(String s) {
+        boolean answer = true;
+        char[] arr = s.toCharArray();
+        int cur = 0;
+        
+        for (int i = 0; i < arr.length; i++){
+            cur += (arr[i] == '(')?1:-1;
+            if (cur < 0 ) return false;
+        }
+        if (cur != 0) return false;
+
+
+        return true;
+    }
+}
+```