func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 1000 * 100 + 5;   const long long inf = 9223372036854775807;   int n, q, cnt, mark[3][maxn];   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     ;     cin >> n >> q;     for (int i = 1; i <= q; i++) {       int x, y;       cin >> x >> y;       if (mark[x][y] == 0) {         mark[x][y] = 1;         if (mark[3 - x][y] == 1) cnt++;         if (mark[3 - x][y - 1] == 1) cnt++;         if (mark[3 - x][y + 1] == 1) cnt++;       } else {         mark[x][y] = 0;         if (mark[3 - x][y] == 1) cnt--;         if (mark[3 - x][y - 1] == 1) cnt--;         if (mark[3 - x][y + 1] == 1) cnt--;       }       if (cnt > 0)         cout <<  No ;       else         cout <<  Yes ;       cout << endl;     }   }   