func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 5006;   const int mod = 1000000009;   double x[maxn], y[maxn], z[maxn];   double d[maxn][maxn];   int n;   double dis(double x1, double y1, double z1, double x2, double y2, double z2) {     double dx = x1 - x2;     double dy = y1 - y2;     double dz = z1 - z2;     return sqrt(dx * dx + dy * dy + dz * dz);   }   double getans() {     double ret = 100000000000.0;     for (int i = 1; i < n; ++i)       for (int j = i + 1; j < n; ++j) {         double dd = d[i][j] + d[0][i] + d[0][j];         ret = min(ret, dd);       }     return ret;   }   void init() {     for (int i = 0; i < n; ++i)       for (int j = 0; j < n; ++j)         d[i][j] = dis(x[i], y[i], z[i], x[j], y[j], z[j]);   }   int main() {     while (~scanf( %d , &n)) {       for (int i = 0; i < n; ++i) {         scanf( %lf%lf%lf , x + i, y + i, z + i);       }       init();       double ans = getans();       ans /= 2;       printf( %.9lf n , ans);     }     return 0;   }   