#include<iostream>
#include<cstring>
#include<algorithm>
#include<stack>
using namespace std;

char s[105];
stack<char> q;

int main()
{
	scanf("%s",s);
	int len = strlen(s);
	for(int i=0;i<len;i++)
	{
		if(s[i] == '(') q.push('(');
		if(s[i] == ')') 
		{
			if(q.empty())
			{
				printf("NO\n");
				return 0;
			}
			q.pop();
		}
	}
	printf("YES\n");
	return 0;
}

提示：

$SubmissionError: unable to fetch record id$