func_code_string: #include <bits/stdc++.h>   using namespace std;   const int INF = 0x7f7f7f7f;   const int MOD = 1e9 + 7;   const double eps = 1e-6;   int main() {     int n, r, v;     scanf( %d%d%d , &n, &r, &v);     double s = acos(-1.0) * r * 2;     while (n--) {       int a, b;       scanf( %d%d , &a, &b);       double d = b - a;       int c = (d / s);       double len = d - c * s;       double L = 0, R = len;       double mid = (L + R) / 2;       while (R - L >= eps) {         if (mid + 2 * r * sin(mid / 2 / r) >= len)           R = mid;         else           L = mid;         mid = (L + R) / 2;       }       printf( %.12lf n , (c * s + mid) / v);     }     return 0;   }   