func_code_string: #include <bits/stdc++.h>   using namespace std;   const long double eps = 1e-10;   const int maxn = 1000 * 1000 * 1000 + 2;   int n;   int a[3][5 * 100 * 1000 + 2];   long double s, e = maxn;   bool check(long double x) {     long double maxr = -1000000001;     for (int i = 0; i < n; i++) {       if (a[2][i] > 0 &&           (long double)(a[1][i] + (long double)(((long double)x) *                                                 ((long double)a[2][i]))) > maxr)         maxr = (long double)(a[1][i] + (long double)(((long double)x) *                                                      ((long double)a[2][i])));       if (a[2][i] < 0 && maxr != -1000000001 &&           maxr >= (long double)(a[1][i] + (long double)(((long double)x) *                                                         ((long double)a[2][i]))))         return 1;     }     return 0;   }   long double bs(long double x, long double y) {     if (y - x < eps) return x;     long double min = (long double)((x + y) / (long double)2.0);     if (check(min))       return bs(x, min);     else       return bs(min, y);   }   int main() {     cout << fixed << setprecision(12);     cin >> n;     for (int i = 0; i < n; i++) cin >> a[1][i] >> a[2][i];     if (!check(1000 * 1000 * 1000 + 1.0)) {       cout << -1 <<  .00000000000000000000  << endl;       return 0;     }     cout << bs(s, e) << endl;     return 0;   }   