updated at 2022. 12. 20. 오후 11:54:05

programmers/짝지어 제거하기/solution.java

@@ -1,19 +1,13 @@
 // [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/12973
 
-class Solution
+import java.util.Stack;
-{
+class Solution{
-    public int solution(String s)
+    public int solution(String s){
-    {
+        Stack<Character> stack = new Stack<>();
-        int idx = 0;
-        char[] stack = new char[s.length()];
         for(char ss : s.toCharArray()){
-            if(idx > 0 && stack[idx-1] == ss){
+            if(!stack.empty() && stack.peek() == ss) stack.pop();
-                idx -= 1;
+            else stack.push(ss);
-            } else{
-                stack[idx] = ss;
-                idx++;
-            }
         }
-        return (idx==0)?1:0;
+        return (stack.empty())?1:0;
     }
 }