func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 5005;   struct Point {     double x, y, z;   };   double dist(Point a, Point b) {     return sqrt((a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y) +                 (a.z - b.z) * (a.z - b.z));   }   Point p[MAXN];   double dis[MAXN];   int main() {     int n;     while (scanf( %d , &n) != EOF) {       for (int i = 0; i < n; i++) scanf( %lf%lf%lf , &p[i].x, &p[i].y, &p[i].z);       for (int i = 1; i < n; i++) dis[i] = dist(p[0], p[i]);       double ta = 100000.0;       for (int i = 1; i < n - 1; i++) {         for (int j = i + 1; j < n; j++) {           double tmp = dist(p[j], p[i]);           double td;           if (dis[i] > dis[j])             td = (tmp - dis[i] + dis[j]) / 2 + dis[i];           else             td = (tmp - dis[j] + dis[i]) / 2 + dis[j];           if (ta > td) ta = td;         }       }       printf( %.6lf n , ta);     }     return 0;   }   