func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 200;   typedef long long matrix[N][N];   const long long MOD = 1000000007;   const double EPS = 1e-8;   const double PI = 2 * acos(0);   const int maxn = 1e6 + 6;   int main() {     cin.sync_with_stdio(false);     int n, ans = 0, a[100100], p[100100];     cin >> n;     for (int i = 1; i <= n; i++) cin >> a[i] >> p[i];     int i = 1;     while (i <= n) {       ans += a[i] * p[i];       for (int j = i + 1; j <= n; j++) {         if (p[j] < p[i]) {           i = j - 1;           break;         }         ans += a[j] * p[i];         if (j == n) i = n;       }       i++;     }     cout << ans;   }   