feat : 인프런 3주차 40 쇠막대기

src/main/java/sgyj/inflearn/yeji/week4/Solution40.java

@@ -0,0 +1,36 @@
+package sgyj.inflearn.yeji.week4;
+
+import java.util.Scanner;
+import java.util.Stack;
+
+public class Solution40 {
+
+    public static int solution(String[] input){
+        int answer = 0;
+        Stack<String> stack = new Stack();
+        int lt = Integer.MIN_VALUE;
+        int rt = Integer.MIN_VALUE;
+        for(int i = 0;i<input.length; i++){
+            if(input[i].equals("(")){
+                lt = i;
+                stack.push("(");
+            }else{
+                rt = i;
+                if(rt-lt==1){
+                    stack.pop();
+                    answer+=stack.size();
+                }else{
+                    stack.pop();
+                    answer+=1;
+                }
+            }
+        }
+        return answer;
+    }
+
+    public static void main(String[] args){
+        Scanner sc = new Scanner(System.in);
+        String input = sc.nextLine();
+        System.out.println(solution(input.split("")));
+    }
+}