func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, m, a[110];   double f[110][110][110], C[110][110];   int main() {     scanf( %d%d , &n, &m);     for (int i = 1; i <= m; i++) scanf( %d , &a[i]);     C[0][0] = 1;     for (int i = 1; i <= 55; i++) {       C[i][0] = 1;       for (int j = 1; j <= i; j++) C[i][j] = C[i - 1][j] + C[i - 1][j - 1];     }     for (int i = 0; i <= n; i++) f[0][0][i] = i;     for (int i = 1; i <= m; i++)       for (int j = 0; j <= n; j++)         for (int k = 0; k <= n; k++)           for (int c = 0; c <= j; c++) {             int _max = max(k, (c % a[i] == 0) ? (c / a[i]) : (c / a[i] + 1));             f[i][j][k] +=                 f[i - 1][j - c][_max] * pow(i - 1, j - c) / pow(i, j) * C[j][c];           }     printf( %.10f n , f[m][n][0]);     return 0;   }   