題目:
https://onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=12&page=show_problem&problem=997
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| #include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
int main(){
int s;
cin >> s;
while(s--){
int n, i;
double p;
cin >> n >> p >> i;
if(p == 0.0){
cout << fixed << setprecision(4) << 0.0 << '\n';
continue;
}
double a = p * pow(1-p, i-1);
double b = 1 - pow(1-p, n);
cout << fixed << setprecision(4) << a/b << '\n';
}
return 0;
}
|
