func_code_string: #include <bits/stdc++.h>   using namespace std;   const double ESP = 1e-9;   const int N = 2e5 + 1;   int arr[N], n;   bool canCover(double d) {     int used = 0;     double lastcoverd = 0.0;     for (int i = 0; i < n; ++i) {       if (arr[i] > lastcoverd) {         lastcoverd = arr[i] + (2 * d);         ++used;       }     }     return used <= 3;   }   double bs() {     double low = 0, high = 2e9 + 1, mid;     while (high - low > ESP) {       mid = low + (high - low) / 2;       if (canCover(mid)) {         high = mid;       } else {         low = mid;       }     }     return high;   }   int main() {     scanf( %d , &n);     for (int i = 0; i < n; ++i) {       scanf( %d , arr + i);     }     sort(arr, arr + n);     double d = bs();     printf( %.7f n , d);     int used = 0;     double lastcoverd = 0.0;     for (int i = 0; i < n; ++i) {       if (arr[i] - lastcoverd > ESP) {         lastcoverd = arr[i] + (2 * d);         printf( %.7f  , arr[i] + d);         used++;       }     }     while (used < 3) {       printf( %.7f  , 0.0);       ++used;     }     printf(  n );     return 0;   }   