답안 #389092

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
389092	2021-04-13T15:43:40 Z	denkendoemeer	Asceticism (JOI18_asceticism)	C++14	100 / 100	16 ms	1872 KB

asceticism

#include<bits/stdc++.h>
#define ll long long
const int inf=1e9;
#define mod 1000000007
using namespace std;
int fact[200005],inv[200005];
int po(int b,int e)
{
    int p=1;
    while(e){
        if (e%2==1)
            p=1LL*p*b%mod;
        b=1LL*b*b%mod;
        e=e/2;
    }
    return p;
}
int comb(int n,int k)
{
    return 1LL*fact[n]*inv[k]%mod*inv[n-k]%mod;
}
int calc(int n,int k)
{
    if (k>n)
        return 0;
    int ans=0,i;
    for(i=0;i<=k;i++){
        int aux=1LL*comb(n+1,i)*po(k+1-i,n)%mod;
        if (i%2==1)
            ans=(ans-aux+mod)%mod;
        else
            ans=(ans+aux)%mod;
    }
    return ans;
}
int main()
{
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    int n,k,i;
    fact[0]=1;
    for(i=1;i<=200000;i++)
        fact[i]=1LL*fact[i-1]*i%mod;
    inv[200000]=po(fact[200000],mod-2);
    for(i=199999;i>=0;i--)
        inv[i]=1LL*inv[i+1]*(i+1)%mod;
    scanf("%d%d",&n,&k);
    printf("%d\n",calc(n,k-1));
return 0;
}

Compilation message

asceticism.cpp: In function 'int main()':
asceticism.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   47 |     scanf("%d%d",&n,&k);
      |     ~~~~~^~~~~~~~~~~~~~

Subtask #1

4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	1868 KB	Output is correct
2	Correct	4 ms	1868 KB	Output is correct
3	Correct	4 ms	1868 KB	Output is correct
4	Correct	4 ms	1868 KB	Output is correct
5	Correct	4 ms	1868 KB	Output is correct
6	Correct	4 ms	1868 KB	Output is correct
7	Correct	4 ms	1792 KB	Output is correct
8	Correct	4 ms	1860 KB	Output is correct
9	Correct	4 ms	1868 KB	Output is correct
10	Correct	4 ms	1868 KB	Output is correct

Subtask #2

20.0 / 20.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	1868 KB	Output is correct
2	Correct	4 ms	1868 KB	Output is correct
3	Correct	4 ms	1868 KB	Output is correct
4	Correct	4 ms	1868 KB	Output is correct
5	Correct	4 ms	1868 KB	Output is correct
6	Correct	4 ms	1868 KB	Output is correct
7	Correct	4 ms	1792 KB	Output is correct
8	Correct	4 ms	1860 KB	Output is correct
9	Correct	4 ms	1868 KB	Output is correct
10	Correct	4 ms	1868 KB	Output is correct
11	Correct	4 ms	1868 KB	Output is correct
12	Correct	4 ms	1864 KB	Output is correct
13	Correct	4 ms	1864 KB	Output is correct
14	Correct	4 ms	1740 KB	Output is correct
15	Correct	4 ms	1860 KB	Output is correct
16	Correct	4 ms	1868 KB	Output is correct
17	Correct	4 ms	1864 KB	Output is correct
18	Correct	6 ms	1868 KB	Output is correct
19	Correct	5 ms	1868 KB	Output is correct
20	Correct	5 ms	1864 KB	Output is correct

Subtask #3

25.0 / 25.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	1868 KB	Output is correct
2	Correct	4 ms	1868 KB	Output is correct
3	Correct	4 ms	1868 KB	Output is correct
4	Correct	4 ms	1868 KB	Output is correct
5	Correct	4 ms	1868 KB	Output is correct
6	Correct	4 ms	1868 KB	Output is correct
7	Correct	4 ms	1792 KB	Output is correct
8	Correct	4 ms	1860 KB	Output is correct
9	Correct	4 ms	1868 KB	Output is correct
10	Correct	4 ms	1868 KB	Output is correct
11	Correct	4 ms	1868 KB	Output is correct
12	Correct	4 ms	1864 KB	Output is correct
13	Correct	4 ms	1864 KB	Output is correct
14	Correct	4 ms	1740 KB	Output is correct
15	Correct	4 ms	1860 KB	Output is correct
16	Correct	4 ms	1868 KB	Output is correct
17	Correct	4 ms	1864 KB	Output is correct
18	Correct	6 ms	1868 KB	Output is correct
19	Correct	5 ms	1868 KB	Output is correct
20	Correct	5 ms	1864 KB	Output is correct
21	Correct	4 ms	1868 KB	Output is correct
22	Correct	4 ms	1868 KB	Output is correct
23	Correct	4 ms	1868 KB	Output is correct
24	Correct	4 ms	1868 KB	Output is correct
25	Correct	4 ms	1868 KB	Output is correct
26	Correct	4 ms	1868 KB	Output is correct
27	Correct	4 ms	1868 KB	Output is correct
28	Correct	4 ms	1868 KB	Output is correct
29	Correct	4 ms	1740 KB	Output is correct
30	Correct	4 ms	1872 KB	Output is correct

Subtask #4

51.0 / 51.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	1868 KB	Output is correct
2	Correct	4 ms	1868 KB	Output is correct
3	Correct	4 ms	1868 KB	Output is correct
4	Correct	4 ms	1868 KB	Output is correct
5	Correct	4 ms	1868 KB	Output is correct
6	Correct	4 ms	1868 KB	Output is correct
7	Correct	4 ms	1792 KB	Output is correct
8	Correct	4 ms	1860 KB	Output is correct
9	Correct	4 ms	1868 KB	Output is correct
10	Correct	4 ms	1868 KB	Output is correct
11	Correct	4 ms	1868 KB	Output is correct
12	Correct	4 ms	1864 KB	Output is correct
13	Correct	4 ms	1864 KB	Output is correct
14	Correct	4 ms	1740 KB	Output is correct
15	Correct	4 ms	1860 KB	Output is correct
16	Correct	4 ms	1868 KB	Output is correct
17	Correct	4 ms	1864 KB	Output is correct
18	Correct	6 ms	1868 KB	Output is correct
19	Correct	5 ms	1868 KB	Output is correct
20	Correct	5 ms	1864 KB	Output is correct
21	Correct	4 ms	1868 KB	Output is correct
22	Correct	4 ms	1868 KB	Output is correct
23	Correct	4 ms	1868 KB	Output is correct
24	Correct	4 ms	1868 KB	Output is correct
25	Correct	4 ms	1868 KB	Output is correct
26	Correct	4 ms	1868 KB	Output is correct
27	Correct	4 ms	1868 KB	Output is correct
28	Correct	4 ms	1868 KB	Output is correct
29	Correct	4 ms	1740 KB	Output is correct
30	Correct	4 ms	1872 KB	Output is correct
31	Correct	4 ms	1868 KB	Output is correct
32	Correct	4 ms	1868 KB	Output is correct
33	Correct	5 ms	1824 KB	Output is correct
34	Correct	7 ms	1868 KB	Output is correct
35	Correct	13 ms	1860 KB	Output is correct
36	Correct	14 ms	1868 KB	Output is correct
37	Correct	16 ms	1740 KB	Output is correct
38	Correct	5 ms	1864 KB	Output is correct
39	Correct	7 ms	1740 KB	Output is correct
40	Correct	8 ms	1868 KB	Output is correct