func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     cin.tie(0);     int i, n, e;     double x1, y1, x2, y2, vmax, t, vx, vy, wx, wy;     cin >> x1 >> y1 >> x2 >> y2;     cin >> vmax >> t;     cin >> vx >> vy;     cin >> wx >> wy;     double sid;     double l = 0.0, r = (double)1e9;     double eps = 1e-7;     double x, y;     while (r - l > eps) {       sid = (r + l) / 2.0;       if (sid < t) {         x = x1 + sid * vx;         y = y1 + sid * vy;       } else {         x = x1 + t * vx + (sid - t) * wx;         y = y1 + t * vy + (sid - t) * wy;       }       double val;       val = (x2 - x) * (x2 - x) + (y2 - y) * (y2 - y);       val = sqrt(val);       if (val < vmax * sid) {         r = sid;       } else         l = sid;     }     cout << setprecision(8);     cout << fixed;     cout << r <<   n ;     return 0;   }   