Submission #15835

#	Time	Username	Problem	Language	Result	Execution time	Memory
15835		comet	맛있는 과자 (kriii3_A)	C++98	0 / 33	0 ms	1192 KiB

A

#include<cstdio>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;
typedef long long ll;
void f(double a,double b,double c,ll N,ll K){
	if(N<0){
		printf("%.12f",a+b-(double)log(2.0));
		return;
	}
	if(a>b+1e-9)swap(a,b);
	if(K<=(1ll<<N)){
		f(a+b-c,(double)2.0*b-c,b,N-1,K);
	}
	else{
		f((double)2.0*a-c,a+b-c,a,N-1,K-(1ll<<N));
	}
}
int main(){
	ll N,K;
	double a,b,c;
	scanf("%lf%lf%lld%lld",&a,&b,&N,&K);
	if(a>b)swap(a,b);
	c=(double)sqrt(a*a+b*b);
	f((double)log(a),(double)log(b),(double)log(c),N-1,K);
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 23