oj.uz

답안 #15816

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
15816 2015-07-30T00:21:01 Z jihoon 맛있는 과자 (kriii3_A) C++
33 / 33
 0 ms 1204 KB 
#include<cstdio>
#include<cmath>
long long int ncr[41][41];
int main(){
	int a,b,n,t;
	double lna,lnb,lnn;
	long long int k,sum=0;
	scanf("%d %d %d %lld",&a,&b,&n,&k);
	//printf("%d %d %d %lld\n",a,b,n,k);
	ncr[0][0]=1;
	if(a>b){
		t=a;a=b;b=t;
	}
	t=a*a+b*b;
	lna=log((a*a)/(double)t);
	lnb=log((b*b)/(double)t);
	lnn=log(a*b/2.0);
	for(int i=1;i<=n;i++){
		ncr[i][0]=1;
		for(int j=1;j<=i;j++){
			ncr[i][j]=ncr[i-1][j-1]+ncr[i-1][j];
		}
	}
	for(int i=0;i<=n;i++){
		sum+=ncr[n][i];
		//printf("%d %lld %lld\n",i,sum,k);
		if(sum>=k){
			printf("%.12f",i*lna+(n-i)*lnb+lnn);
			return 0;
		}
	}
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 1204 KB Output is correct
2 Correct 0 ms 1204 KB Output is correct
3 Correct 0 ms 1204 KB Output is correct
4 Correct 0 ms 1204 KB Output is correct
5 Correct 0 ms 1204 KB Output is correct
6 Correct 0 ms 1204 KB Output is correct
7 Correct 0 ms 1204 KB Output is correct
8 Correct 0 ms 1204 KB Output is correct
9 Correct 0 ms 1204 KB Output is correct
10 Correct 0 ms 1204 KB Output is correct
11 Correct 0 ms 1204 KB Output is correct
12 Correct 0 ms 1204 KB Output is correct
13 Correct 0 ms 1204 KB Output is correct
14 Correct 0 ms 1204 KB Output is correct
15 Correct 0 ms 1204 KB Output is correct
16 Correct 0 ms 1204 KB Output is correct
17 Correct 0 ms 1204 KB Output is correct
18 Correct 0 ms 1204 KB Output is correct
19 Correct 0 ms 1204 KB Output is correct
20 Correct 0 ms 1204 KB Output is correct
21 Correct 0 ms 1204 KB Output is correct
22 Correct 0 ms 1204 KB Output is correct
23 Correct 0 ms 1204 KB Output is correct
24 Correct 0 ms 1204 KB Output is correct
25 Correct 0 ms 1204 KB Output is correct

Subtask #2
23.0 / 23.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 1204 KB Output is correct
2 Correct 0 ms 1204 KB Output is correct
3 Correct 0 ms 1204 KB Output is correct
4 Correct 0 ms 1204 KB Output is correct
5 Correct 0 ms 1204 KB Output is correct
6 Correct 0 ms 1204 KB Output is correct
7 Correct 0 ms 1204 KB Output is correct
8 Correct 0 ms 1204 KB Output is correct
9 Correct 0 ms 1204 KB Output is correct
10 Correct 0 ms 1204 KB Output is correct
11 Correct 0 ms 1204 KB Output is correct
12 Correct 0 ms 1204 KB Output is correct
13 Correct 0 ms 1204 KB Output is correct
14 Correct 0 ms 1204 KB Output is correct
15 Correct 0 ms 1204 KB Output is correct
16 Correct 0 ms 1204 KB Output is correct
17 Correct 0 ms 1204 KB Output is correct
18 Correct 0 ms 1204 KB Output is correct
19 Correct 0 ms 1204 KB Output is correct
20 Correct 0 ms 1204 KB Output is correct
21 Correct 0 ms 1204 KB Output is correct
22 Correct 0 ms 1204 KB Output is correct
23 Correct 0 ms 1204 KB Output is correct
24 Correct 0 ms 1204 KB Output is correct
25 Correct 0 ms 1204 KB Output is correct