题意:
分析:
1 #include <iostream> 2 #include <cstring> 3 #include <cstdlib> 4 #include <cmath> 5 #include <cstdio> 6 #include <vector> 7 #include <algorithm> 8 #define LL long long 9 using namespace std; 10 11 int main() 12 { 13 int i; 14 double ans, n, m, temp, pre; 15 while(cin>>m>>n) 16 { 17 ans = pow(1.0/m, n); 18 pre = ans; 19 for(i = 2; i <= m; i++) 20 { 21 temp = pow(i/m, n); 22 ans += (temp-pre)*i; 23 pre = temp; 24 } 25 26 printf("%.4lf\n", ans); 27 } 28 return 0; 29 }
Codeforces Round #259 (Div. 2) C - Little Pony and Expected Maximum
时间: 2024-10-13 14:06:02