func_code_string: #include <bits/stdc++.h>   using namespace std;   const int mn = 500005;   int n, fp, ln;   pair<double, double> inp[mn];   bool f(double mid) {     double ma = -(int)1e9;     for (int i = fp; i < ln + 1; i++) {       double pos = inp[i].first + mid * inp[i].second;       if (inp[i].second < 0) {         if (pos <= ma) return 1;       } else         ma = max(ma, pos);     }     return 0;   }   int main() {     n = ({       int t;       scanf( %d , &t);       t;     });     for (int i = 0; i < n; i++)       inp[i].first = ({         int t;         scanf( %d , &t);         t;       }),       inp[i].second = ({         int t;         scanf( %d , &t);         t;       });     fp = ln = -1;     for (int i = n - 1; i >= 0; i--)       if (inp[i].second > 0) fp = i;     for (int i = 0; i < n; i++)       if (inp[i].second < 0) ln = i;     if (fp == -1 || ln == -1 || fp > ln) {       printf( -1 n );       return 0;     }     double lo = 0, hi = double(1e9) + 5, mid = (lo + hi) / 2;     for (int times = 0; times < 100; times++) {       if (f(mid))         hi = mid;       else         lo = mid;       mid = (lo + hi) / 2;     }     printf( %.15lf n , mid);     return 0;   }   