import org.junit.Test;

import java.util.Stack;

/**
 * @author zhangruihao.zhang
 * @version v1.0.0
 * @since 2019/04/29
 */
public class LeetCode_20_108 {
        public static void main(String[] args) {
            String str = "()[]{}";
            System.out.println(isValid(str));
        }
        public  static boolean isValid(String s) {
            Stack stack = new Stack();
            for(int i=0;i