Submission #19698

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
19698	2016-02-25T04:41:36 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;
main()
{
    scanf("%lld%lld",&a,&b);
    if(b>=a)
    {
        printf("0");return 0;
    }
    for(;b<=a-1;){
    b++;ans=0;
    mul[a-b+1]=1;
    for(i=a-b;i>=1;i--)
    {
        mul[i]=mul[i+1]*i%X;
    }
    fac[0]=1;
    for(i=1;i<=a;i++)fac[i]=fac[i-1]*i%X;
    for(i=1;i<=a&&a-i>=0&&a-b+2-i>=1;i++)
    {
        ans+=i*b%X*fac[a-i]%X*mul[a-b+2-i]%X;
        ans%=X;
    }

    mans+=ans*(a-b+1)%X;
    mans%=X;
    }
    printf("%lld",mans);
}

Subtask #1

8.0 / 8.0

#	Verdict	Execution time	Memory	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	16 ms	16708 KB	Output is correct
18	Correct	3 ms	16708 KB	Output is correct
19	Correct	9 ms	16708 KB	Output is correct
20	Correct	14 ms	16708 KB	Output is correct
21	Correct	18 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	30 ms	16708 KB	Output is correct
25	Correct	0 ms	16708 KB	Output is correct
26	Correct	23 ms	16708 KB	Output is correct
27	Correct	0 ms	16708 KB	Output is correct
28	Correct	66 ms	16708 KB	Output is correct
29	Correct	64 ms	16708 KB	Output is correct
30	Correct	13 ms	16708 KB	Output is correct

Subtask #2

0.0 / 92.0

#	Verdict	Execution time	Memory	Grader output
1	Execution timed out	2000 ms	16704 KB	Program timed out
2	Halted	0 ms	0 KB	-