235B - Let's Play Osu - CodeForces Solution


dp math probabilities *2000

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C++ Code:

#include<bits/stdc++.h>
using namespace std;
long double F,l,x;
int n;
int main(){
	cin>>n;
	for(int i=1;i<=n;++i)
		cin>>x,l=(l+1)*x,F+=l*2-x;
	printf("%.10Lf",F);
}


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