func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     double a, b, mn = 1e12;     cin >> a >> b;     int n;     cin >> n;     while (n--) {       double x, y, v, dis;       cin >> x >> y >> v;       dis = sqrt((a - x) * (a - x) + (b - y) * (b - y));       dis /= v;       mn = min(mn, dis);     }     cout << fixed << setprecision(7) << mn << endl;     return 0;   }   