这道题的传送门，感兴趣的小伙伴可以把我的代码提交一下

#include <bits/stdc++.h>
using namespace std;
int main() {
    freopen("expression.in", "r", stdin);
    freopen("expression.out", "w", stdout);
    string s;
    cin >> s;
    int a = 0, b = 0;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] == '(') a++;
        if (s[i] == ')') b++;
    }
    if (a == b && (a + b) % 2 == 0) cout << "YES";
    else cout << "NO";
    return 0;
}