Submission #15177

#	Time	Username	Problem	Language	Result	Execution time	Memory
15177		ainta	맛있는 과자 (kriii3_A)	C++98	33 / 33	0 ms	1204 KiB

A

#include<stdio.h>
#include<algorithm>
#include<math.h>
using namespace std;
long long K, C[41][41], S;
int a, b, n;
double Res;
int main()
{
    int i, j, x;
    scanf("%d%d%d%lld",&a,&b,&n,&K);
    if(a<b)swap(a,b);
    for(i=0;i<=n;i++){
        C[i][0]=1;
        for(j=1;j<=i;j++)C[i][j]=C[i-1][j-1]+C[i-1][j];
    }
    for(i=0;i<=n;i++){
        S+=C[n][i];
        if(S>=K)break;
    }
    x = i;
    Res=a*b*0.5;
    Res = log(Res);
    for(i=1;i<=x;i++){
        Res=Res+log(b*b)-log(a*a+b*b);
    }
    for(i=1;i<=n-x;i++){
        Res=Res+log(a*a)-log(a*a+b*b);
    }
    printf("%.11lf\n",Res);
}

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