func_code_string: #include <bits/stdc++.h>   using namespace std;   const double EXP = 1e-11;   const int maxn = 2e5 + 10;   int n;   double a[maxn];   double a2[maxn];   double Judge(double x) {     double sum1 = 0.0, sum2 = 0.0, sum3 = 0.0;     for (int i = 1; i <= n; i++) a2[i] = a[i] - x;     for (int i = 1; i <= n; i++) {       sum1 = max(sum1 + a2[i], a2[i]);       sum3 = max(sum3, sum1);     }     for (int i = 1; i <= n; i++) a2[i] = a2[i] * (-1.0);     for (int i = 1; i <= n; i++) {       sum2 = max(sum2 + a2[i], a2[i]);       sum3 = max(sum3, sum2);     }     return sum3;   }   int main() {     scanf( %d , &n);     for (int i = 1; i <= n; i++) scanf( %lf , &a[i]);     double l = -40000.0, r = 40000.0;     while (r - l > EXP) {       double mid = (l + l + r) / 3.0;       double mmid = (l + r + r) / 3.0;       if (Judge(mid) >= Judge(mmid))         l = mid;       else         r = mmid;     }     printf( %.13lf n , min(Judge(l), Judge(r)));     return 0;   }   