func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, by, ay;   double mxy, l, r, m, D, x1[100005], x2[100005], x[100005], y[100005], mx1, mx2;   bool b;   int main() {     cin >> n;     for (int i = 0; i < n; i++) {       cin >> x[i] >> y[i];       if (y[i] > 0) ay = 1;       if (y[i] < 0) by = 1;       y[i] = abs(y[i]);       mxy = max(mxy, y[i]);     }     if (ay + by == 2) {       cout << -1 << endl;       return 0;     }     l = mxy / 2;     r = 1000000000000003;     for (int w = 0; w < 200; w++) {       b = 0;       mx1 = -1000000000000000;       mx2 = 1000000000000000;       m = (l + r) / 2;       for (int i = 0; i < n; i++) {         D = 2 * m * y[i] - y[i] * y[i];         if (D < 0) {           b = 1;           break;         }         x1[i] = x[i] - sqrt(D);         x2[i] = x[i] + sqrt(D);         mx1 = max(mx1, x1[i]);         mx2 = min(mx2, x2[i]);       }       if (mx1 > mx2 || b)         l = m;       else         r = m;     }     printf( %f , l);     return 0;   }   