func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   double r, v;   double a, b;   bool check(double l) {     double arfa = l / r;     double A = r * (1 - cos(arfa));     double B = r * sin(arfa);     return l + sqrt(A * A + B * B) >= b - a;   }   int main() {     cin >> n >> r >> v;     while (n--) {       scanf( %lf%lf , &a, &b);       double l = 0, r = b - a, ans;       for (int i = 1; i <= 100; i++) {         double mid = (l + r) / 2.0;         if (check(mid))           ans = mid, r = mid;         else           l = mid;       }       printf( %.10f n , ans / v);     }     return 0;   }   