답안 #19820

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
19820	2016-02-25T05:56:31 Z	Namnamseo	순열 (kriii4_T)	C++14	8 / 100	2000 ms	16708 KB

T

#include<cstdio>
long long mans,c,mul[1000003],fac[1000003],a,b,i,j,s=1,ans,X=1e9+7;
long long pow(long long aa,long long bb){
    if(bb==0) return 1;
    long long ret=pow(aa,bb/2);
    ret=(ret*ret)%X;
    if(bb&1) ret=(ret*aa)%X;
    return ret;
}
long long com(long long aa,long long bb)
{
    return fac[aa]*pow(fac[bb],X-2)%X*pow(fac[aa-bb],X-2)%X;
}
main()
{
    scanf("%lld%lld",&a,&b);
    if(b>=a)
    {
        printf("0");return 0;
    }
    fac[0]=1;
    for(i=1;i<=a+1;i++)fac[i]=fac[i-1]*i%X;
    for(i=b+1;i<=a;i++)
    {
        mans+=fac[i]*fac[a-i+1]%X*com(a+1,i+1)%X;
        mans%=X;
    }
    printf("%lld",mans);
}

Subtask #1

8.0 / 8.0

#	결과	실행 시간	메모리	Grader output
1	Correct	0 ms	16708 KB	Output is correct
2	Correct	0 ms	16708 KB	Output is correct
3	Correct	0 ms	16708 KB	Output is correct
4	Correct	0 ms	16708 KB	Output is correct
5	Correct	0 ms	16708 KB	Output is correct
6	Correct	0 ms	16708 KB	Output is correct
7	Correct	0 ms	16708 KB	Output is correct
8	Correct	0 ms	16708 KB	Output is correct
9	Correct	0 ms	16708 KB	Output is correct
10	Correct	0 ms	16708 KB	Output is correct
11	Correct	0 ms	16708 KB	Output is correct
12	Correct	0 ms	16708 KB	Output is correct
13	Correct	0 ms	16708 KB	Output is correct
14	Correct	0 ms	16708 KB	Output is correct
15	Correct	0 ms	16708 KB	Output is correct
16	Correct	0 ms	16708 KB	Output is correct
17	Correct	1 ms	16708 KB	Output is correct
18	Correct	0 ms	16708 KB	Output is correct
19	Correct	0 ms	16708 KB	Output is correct
20	Correct	0 ms	16708 KB	Output is correct
21	Correct	0 ms	16708 KB	Output is correct
22	Correct	0 ms	16708 KB	Output is correct
23	Correct	0 ms	16708 KB	Output is correct
24	Correct	2 ms	16708 KB	Output is correct
25	Correct	0 ms	16708 KB	Output is correct
26	Correct	0 ms	16708 KB	Output is correct
27	Correct	0 ms	16708 KB	Output is correct
28	Correct	0 ms	16708 KB	Output is correct
29	Correct	0 ms	16708 KB	Output is correct
30	Correct	0 ms	16708 KB	Output is correct

Subtask #2

0.0 / 92.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1993 ms	16708 KB	Output is correct
2	Correct	657 ms	16708 KB	Output is correct
3	Correct	260 ms	16708 KB	Output is correct
4	Correct	179 ms	16708 KB	Output is correct
5	Correct	266 ms	16708 KB	Output is correct
6	Correct	180 ms	16708 KB	Output is correct
7	Correct	1597 ms	16708 KB	Output is correct
8	Correct	956 ms	16708 KB	Output is correct
9	Correct	328 ms	16708 KB	Output is correct
10	Correct	52 ms	16708 KB	Output is correct
11	Correct	666 ms	16708 KB	Output is correct
12	Correct	39 ms	16708 KB	Output is correct
13	Correct	308 ms	16708 KB	Output is correct
14	Correct	1380 ms	16708 KB	Output is correct
15	Correct	802 ms	16708 KB	Output is correct
16	Correct	1262 ms	16708 KB	Output is correct
17	Correct	590 ms	16708 KB	Output is correct
18	Correct	562 ms	16708 KB	Output is correct
19	Correct	120 ms	16708 KB	Output is correct
20	Correct	713 ms	16708 KB	Output is correct
21	Correct	470 ms	16708 KB	Output is correct
22	Correct	1197 ms	16708 KB	Output is correct
23	Correct	450 ms	16708 KB	Output is correct
24	Correct	232 ms	16708 KB	Output is correct
25	Correct	247 ms	16708 KB	Output is correct
26	Correct	836 ms	16708 KB	Output is correct
27	Correct	78 ms	16708 KB	Output is correct
28	Correct	32 ms	16708 KB	Output is correct
29	Execution timed out	2000 ms	16708 KB	Program timed out
30	Halted	0 ms	0 KB	-