func_code_string: #include <bits/stdc++.h>   using namespace std;   const long long inf = 1e17 + 10;   const int N = 1e6 + 10;   const long long mod = 998244353;   map<string, int> ml;   long long b[N], vis[N], po[N], num[N], t, n, m, x, y, k, a[N];   long long ex, ey, cnt, ans, sum, flag;   long long dist[N];   long long dp[N];   vector<int> v[N];   map<int, int> mp;   priority_queue<pair<int, int> > q;   priority_queue<pair<int, int> > tq;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cin >> n;     string s;     cin >> s;     for (int i = 0; s[i]; i++) {       a[i] = cnt;       if (s[i] ==  ( )         cnt++;       else         cnt--;       if (a[i - 1] < 0) a[i] = -1;     }     cnt = 0;     for (int i = n - 1; i >= 0; i--) {       b[i] = cnt;       if (s[i] ==  ) )         cnt++;       else         cnt--;       if (b[i + 1] < 0) b[i] = -1;     }     for (int i = 0; s[i]; i++) {       if (a[i] < 0 && b[i] < 0) return cout << 0 << endl, 0;       num[i] = a[i] - b[i];       if (s[i] ==  (  && num[i] == 1 && a[i] >= 0 && b[i] >= 0) ans++;       if (s[i] ==  )  && num[i] == -1 && a[i] >= 0 && b[i] >= 0) ans++;     }     cout << ans << endl;   }   