Submission #1003634

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Source Code Expand

#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)



double rec(int x, double p) {
	if (x % 2)
		return p * rec(x - 1, p) + (1 - p) * rec(x + 1, p) + 1;
	
	return x / p / 2;
}
//-----------------------------------------------------------------
int main() {
	int x, p;
	cin >> x >> p;
	double ans = rec(x, p / 100.0);
	printf("%.10f\n", ans);
}

Submission Info

Judge Result