func_code_string: #include <bits/stdc++.h>   using namespace std;   #pragma comment(linker,  /STACK:64000000 )   const int maxn = 200200;   const int inf = 1000000007;   const int mod = 1000000007;   const int dx[4] = {1, -1, 0, 0};   const int dy[4] = {0, 0, 1, -1};   double pr[maxn];   double pw(double x, int k) {     if (k == 1) return x;     double ans = pw(x, k / 2);     ans = ans * ans;     if (k % 2 == 1) ans = ans * x;     return ans;   }   int main() {     int n, m;     while (scanf( %d%d , &n, &m) == 2) {       pr[n + 1] = 0;       double ans = 0;       for (int i = n; i >= 1; i--) {         pr[i] = 1 - pw((double)(i - 1) / n, m);         ans += i * (pr[i] - pr[i + 1]);       }       printf( %.10lf n , ans);     }     return 0;   }   