爱奇艺java判断括号深度（可惜当时没调出来）

import java.util.Scanner;
import java.util.Stack;
public class Main  {
	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		while(scan.hasNext()){
			String s=scan.next();
			System.out.println(result(s));
		}
		scan.close();
	}
	private static int result(String s) {
		if(s==null||s.equals("")){
			return 0;
		}
		Stack<Character> stack=new Stack<Character>();
		int len=s.length();
		int i=0;
		int max=1;
		while(i<len){
			if(s.charAt(i)=='('){
				stack.add('(');
				max=max>stack.size()?max:stack.size();
			}else{
				stack.pop();
			}
			i++;
		}
		return max;
	}
}