Codeforces 453A Little Pony and Expected Maximum 概率题Orz

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#include <stdio.h>#include <iostream>#include <algorithm>using namespace std;#define INF 0x3f3f3f3f#define eps 1e-8#define pi acos(-1.0)typedef long long ll;int main(){    int i, j;    double m,n;    while(cin>>m>>n){         double ans=m;         for(i=1;i<=m;i++)              ans-=pow((i-1)*1.0/(m),n);         printf("%.10lf\n",ans);    }    return 0;}