func_code_string: #include <bits/stdc++.h>   using namespace std;   long long sqr(long long x) { return x * x; }   int n, m, x, y;   int main() {     cin >> x >> y >> n;     long double ans = 1e9, p = 0;     for (int i = 0; i < n; ++i) {       int x1, y1, v;       cin >> x1 >> y1 >> v;       p = sqrt(sqr(x1 - x) + sqr(y1 - y)) / v;       ans = min(ans, p);     }     cout << fixed << setprecision(10) << ans;   }   