func_code_string: #include <bits/stdc++.h>   using namespace std;   const double PI = acos(-1.0);   const double eps = 1e-8;   const int mod = 1e9 + 7;   const int inf = 1061109567;   const int dir[][2] = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};   map<int, int> mp[100005], vis;   int tot;   int lowbit(int x) { return x & (-x); }   void update(int t, int x, int val) {     for (int i = t; i <= 1e9 + 2; i += lowbit(i)) {       mp[x][i] += val;     }   }   int query(int t, int x) {     int ret = 0;     for (int i = t; i > 0; i -= lowbit(i)) {       ret += mp[x][i];     }     return ret;   }   int main() {     int n, sign, t, x;     cin >> n;     for (int i = 1; i <= n; i++) {       scanf( %d%d%d , &sign, &t, &x);       if (!vis[x]) {         vis[x] = ++tot;       }       if (sign == 1) {         update(t, vis[x], 1);       } else if (sign == 2) {         update(t, vis[x], -1);       } else {         printf( %d n , query(t, vis[x]));       }     }     return 0;   }   