func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MX = 1e5 + 7;   vector<long long> v[MX];   bool vis[MX];   int main() {     ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);     long long n;     cin >> n;     pair<long long, long long> p[n];     for (long long i = 0; i < n; i++) cin >> p[i].first >> p[i].second;     long double l = 0, r = 1e10;     for (long long i = 0; i < 100; i++) {       long long cnt;       long double mid = (l + r) / 2, d = -1e20;       for (cnt = 0; cnt < n; cnt++) {         if (p[cnt].second > 0)           d = max(d, p[cnt].first + mid * p[cnt].second);         else if (p[cnt].first + mid * p[cnt].second <= d)           break;       }       if (cnt < n)         r = mid;       else         l = mid;     }     if (r == 1e10)       cout << -1;     else       cout << fixed << setprecision(18) << l;   }   