func_code_string: #include <bits/stdc++.h>   int main() {     int n, k, i;     double t, z, a, b, d = 0;     scanf( %d %d , &n, &k);     int x[n], y[n];     for (i = 0; i < n; i++) {       scanf( %d %d , &x[i], &y[i]);     }     for (i = 1; i < n; i++) {       a = x[i - 1] - x[i];       b = y[i - 1] - y[i];       a = pow(a, 2);       b = pow(b, 2);       z = a + b;       z = sqrt(z);       d = d + z;     }     t = (d / 50) * k;     printf( %.9lf , t);     return 0;   }   