QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#21285#2817. 鸽鸽的分割DaBenZhongXiaSongKuaiDi#AC ✓3ms3780kbC++20275b2022-03-04 14:30:072022-05-08 02:50:17

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2022-05-08 02:50:17]
  • 评测
  • 测评结果:AC
  • 用时:3ms
  • 内存:3780kb
  • [2022-03-04 14:30:07]
  • 提交

answer

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

int main(){
	unsigned long long k,s,p;
	int n;
	while(scanf("%d",&n)!=EOF){
		s=(unsigned long long)n;k=0;
		k=1ull+n*(n-1)/2ull;
		p=n*(n-1)/2ull;
		p=p*(n-2)/3ull;
		p=p*(n-3)/4ull;
		k=k+p;
		cout<<k<<endl;
	}
}

详细

Test #1:

score: 100
Accepted
time: 3ms
memory: 3780kb

input:

0
1
2
3
4
5
6
7
8
9
10
20
30
40
50
60
61
62
63
64

output:

1
1
2
4
8
16
31
57
99
163
256
5036
27841
92171
231526
489406
523686
559737
597619
637393

result:

ok 20 lines