func_code_string: #include <bits/stdc++.h>   using namespace std;   long double dist(long double x1, long double y1, long double x2,                    long double y2) {     long double D = ((x2 - x1) * (x2 - x1)) + ((y2 - y1) * (y2 - y1));     return sqrt(D);   }   int main() {     const int inf = 1e9;     int n;     cin >> n;     vector<pair<int, pair<pair<int, int>, long double>>> v;     for (int i = 0; i < n; i++) {       int x, y, t;       long double p;       cin >> x >> y >> t >> p;       v.push_back({t, {{x, y}, p}});     }     sort(v.begin(), v.end());     long double ans = 0.0;     vector<long double> dp(n + 1, 0.0);     for (int i = 1; i <= n; i++) dp[i] = v[i - 1].second.second;     dp[0] = 0;     for (int i = 0; i < n; i++) {       for (int j = i - 1; j >= 0; j--) {         long double x1 = (v[i].second.first.first),                     x2 = (v[j].second.first.first);         long double y1 = v[i].second.first.second, y2 = v[j].second.first.second;         if (dist(x1, y1, x2, y2) <= (long double)(v[i].first - v[j].first)) {           dp[i + 1] = max(dp[i + 1], dp[j + 1] + v[i].second.second);         }       }       ans = max(ans, dp[i + 1]);     }     cout << setprecision(14) << ans <<   n ;   }   