哪位好心的大哥帮我下载数据qwq

万分感谢~

#include <bits/stdc++.h>
using namespace std;
#define LL long long
const int N = 1e6 + 10;
const int INF = 0x3f3f3f3f;
string mstr;
int flag = 0;
int main()
{
    cin >> mstr;
    for (int i = 0; i < mstr.length(); i++)
    {
        if (mstr[i] == '(')
            flag++;
        if (mstr[i] == ')')
            flag--;
    }
    if (flag == 0)
        puts("YES");
    else
        puts("NO");
    return 0;
}