Submission #15402

#	Time	Username	Problem	Language	Result	Execution time	Memory
15402		skeksk91	맛있는 과자 (kriii3_A)	C++98	33 / 33	0 ms	1204 KiB

A

#include<stdio.h>
#include<algorithm>
#include<math.h>
long long pascal[41][41];

long long pow(long long n, long long k) {
	if (k == 0) {
		return 1;
	}
	long long temp = pow(n, k / 2);
	if (k % 2 == 0) {
		return temp*temp;
	}
	return temp*temp*n;
}


int main() {
	for (int i = 0; i <= 40; i++) {
		for (int j = 0; j <= i; j++) {
			if (j == 0 || j == i) {
				pascal[i][j] = 1;
			}
			else {
				pascal[i][j] = pascal[i - 1][j] + pascal[i - 1][j - 1];
			}
		}
	}
	long long a, b, n, k;
	scanf("%lld%lld%lld%lld", &a, &b, &n, &k);
	if (a < b) {
		std::swap(a, b);
	}
	long long l = pow(2, n);
	double s = (double)a*b/2;

	for (int i = 0; i <= n; i++) {
		k -= pascal[n][i];
		if (k <= 0) {
			for (int j = 1; j <= i; j++) {
				s = s*b*b / ((a*a) + (b*b));
			}
			for (int j = 1; j <= n-i; j++) {
				s = s*a*a / ((a*a) + (b*b));
			}
			break;
		}
	}
	printf("%.12lf", log(s));

}

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