func_code_string: #include <bits/stdc++.h>   using namespace std;   double table[2][1005];   int main() {     int N, K;     cin >> N >> K;     for (int t = 1; t <= N; t++) {       for (int l = 1; l < 1000; l++) {         double good = ((l + table[(t - 1) & 1][l + 1]) +                        l * ((l + 1) / 2.0 + table[(t - 1) & 1][l])) /                       (l + 1);         table[t & 1][l] = (good + (K - 1.0) * table[(t - 1) & 1][l]) / K;       }       double good = (1000 + 2) / 2.0 + table[(t - 1) & 1][1000];       table[t & 1][1000] = (good + (K - 1.0) * table[(t - 1) & 1][1000]) / K;     }     printf( %.12f n , K * table[N & 1][1]);   }   