답안 #77386 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
77386	2018-09-27T10:09:11 Z	tmwilliamlin168	Asceticism (JOI18_asceticism)	C++14	100 / 100	38 ms	1864 KB

asceticism

#include <bits/stdc++.h>
using namespace std;

#define ll long long

const int mxN=1e5, M=1e9+7;
int n, k;
ll fi[mxN+1], ans;

ll exp(ll b, int p) {
	ll r=1;
	while(p) {
		if(p&1)
			r=b*r%M;
		b=b*b%M;
		p/=2;
	}
	return r;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> k;
	fi[0]=1;
	for(int i=1; i<=n; ++i)
		fi[i]=exp(i, M-2)*fi[i-1]%M;
	for(int j=0; j<=1; ++j)
		for(int i=0; i<k-j; ++i)
			ans+=(i&1^j?M-1:1)*exp(k-j-i, n)%M*fi[i]%M*fi[n-i]%M;
	for(int i=2; i<=n; ++i)
		ans=i*ans%M;
	cout << ans;
}

Compilation message

asceticism.cpp: In function 'int main()':
asceticism.cpp:31:11: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
    ans+=(i&1^j?M-1:1)*exp(k-j-i, n)%M*fi[i]%M*fi[n-i]%M;
          ~^~

Subtask #1
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	632 KB	Output is correct
2	Correct	2 ms	684 KB	Output is correct
3	Correct	2 ms	684 KB	Output is correct
4	Correct	2 ms	684 KB	Output is correct
5	Correct	2 ms	716 KB	Output is correct
6	Correct	2 ms	720 KB	Output is correct
7	Correct	2 ms	872 KB	Output is correct
8	Correct	2 ms	960 KB	Output is correct
9	Correct	2 ms	960 KB	Output is correct
10	Correct	2 ms	960 KB	Output is correct

Subtask #2
20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	632 KB	Output is correct
2	Correct	2 ms	684 KB	Output is correct
3	Correct	2 ms	684 KB	Output is correct
4	Correct	2 ms	684 KB	Output is correct
5	Correct	2 ms	716 KB	Output is correct
6	Correct	2 ms	720 KB	Output is correct
7	Correct	2 ms	872 KB	Output is correct
8	Correct	2 ms	960 KB	Output is correct
9	Correct	2 ms	960 KB	Output is correct
10	Correct	2 ms	960 KB	Output is correct
11	Correct	2 ms	960 KB	Output is correct
12	Correct	2 ms	960 KB	Output is correct
13	Correct	2 ms	960 KB	Output is correct
14	Correct	2 ms	960 KB	Output is correct
15	Correct	2 ms	960 KB	Output is correct
16	Correct	2 ms	960 KB	Output is correct
17	Correct	2 ms	960 KB	Output is correct
18	Correct	2 ms	960 KB	Output is correct
19	Correct	2 ms	960 KB	Output is correct
20	Correct	3 ms	1044 KB	Output is correct

Subtask #3
25.0 / 25.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	632 KB	Output is correct
2	Correct	2 ms	684 KB	Output is correct
3	Correct	2 ms	684 KB	Output is correct
4	Correct	2 ms	684 KB	Output is correct
5	Correct	2 ms	716 KB	Output is correct
6	Correct	2 ms	720 KB	Output is correct
7	Correct	2 ms	872 KB	Output is correct
8	Correct	2 ms	960 KB	Output is correct
9	Correct	2 ms	960 KB	Output is correct
10	Correct	2 ms	960 KB	Output is correct
11	Correct	2 ms	960 KB	Output is correct
12	Correct	2 ms	960 KB	Output is correct
13	Correct	2 ms	960 KB	Output is correct
14	Correct	2 ms	960 KB	Output is correct
15	Correct	2 ms	960 KB	Output is correct
16	Correct	2 ms	960 KB	Output is correct
17	Correct	2 ms	960 KB	Output is correct
18	Correct	2 ms	960 KB	Output is correct
19	Correct	2 ms	960 KB	Output is correct
20	Correct	3 ms	1044 KB	Output is correct
21	Correct	3 ms	1044 KB	Output is correct
22	Correct	2 ms	1044 KB	Output is correct
23	Correct	2 ms	1044 KB	Output is correct
24	Correct	2 ms	1044 KB	Output is correct
25	Correct	2 ms	1044 KB	Output is correct
26	Correct	2 ms	1044 KB	Output is correct
27	Correct	2 ms	1044 KB	Output is correct
28	Correct	2 ms	1044 KB	Output is correct
29	Correct	2 ms	1044 KB	Output is correct
30	Correct	2 ms	1044 KB	Output is correct

Subtask #4
51.0 / 51.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	632 KB	Output is correct
2	Correct	2 ms	684 KB	Output is correct
3	Correct	2 ms	684 KB	Output is correct
4	Correct	2 ms	684 KB	Output is correct
5	Correct	2 ms	716 KB	Output is correct
6	Correct	2 ms	720 KB	Output is correct
7	Correct	2 ms	872 KB	Output is correct
8	Correct	2 ms	960 KB	Output is correct
9	Correct	2 ms	960 KB	Output is correct
10	Correct	2 ms	960 KB	Output is correct
11	Correct	2 ms	960 KB	Output is correct
12	Correct	2 ms	960 KB	Output is correct
13	Correct	2 ms	960 KB	Output is correct
14	Correct	2 ms	960 KB	Output is correct
15	Correct	2 ms	960 KB	Output is correct
16	Correct	2 ms	960 KB	Output is correct
17	Correct	2 ms	960 KB	Output is correct
18	Correct	2 ms	960 KB	Output is correct
19	Correct	2 ms	960 KB	Output is correct
20	Correct	3 ms	1044 KB	Output is correct
21	Correct	3 ms	1044 KB	Output is correct
22	Correct	2 ms	1044 KB	Output is correct
23	Correct	2 ms	1044 KB	Output is correct
24	Correct	2 ms	1044 KB	Output is correct
25	Correct	2 ms	1044 KB	Output is correct
26	Correct	2 ms	1044 KB	Output is correct
27	Correct	2 ms	1044 KB	Output is correct
28	Correct	2 ms	1044 KB	Output is correct
29	Correct	2 ms	1044 KB	Output is correct
30	Correct	2 ms	1044 KB	Output is correct
31	Correct	20 ms	1756 KB	Output is correct
32	Correct	21 ms	1864 KB	Output is correct
33	Correct	21 ms	1864 KB	Output is correct
34	Correct	23 ms	1864 KB	Output is correct
35	Correct	35 ms	1864 KB	Output is correct
36	Correct	36 ms	1864 KB	Output is correct
37	Correct	38 ms	1864 KB	Output is correct
38	Correct	7 ms	1864 KB	Output is correct
39	Correct	20 ms	1864 KB	Output is correct
40	Correct	29 ms	1864 KB	Output is correct

답안 #77386

Compilation message

Subtask #1 4.0 / 4.0

Subtask #2 20.0 / 20.0

Subtask #3 25.0 / 25.0

Subtask #4 51.0 / 51.0

Subtask #1
4.0 / 4.0

Subtask #2
20.0 / 20.0

Subtask #3
25.0 / 25.0

Subtask #4
51.0 / 51.0