답안 #20102

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
20102 2016-02-25T13:34:25 Z imsifile 순열 (kriii4_T) C++
100 / 100
381 ms 1084 KB
#include<stdio.h>
#define mod 1000000007
#define inv(a) exp(a,mod-2)

typedef long long lld;

lld exp(lld a, lld b){
	if(b==0)return 1;
	lld k=exp(a, b/2);
	k=(k*k)%mod;
	if(b%2)k=(k*a)%mod;
	return k;
}

lld n, k, sum;

int main(){
	lld i, fac=1;
	scanf("%lld%lld", &n, &k);
	for(i=1; i<=n+1; i++)fac=(fac*i)%mod;
	for(i=k+1; i<=n; i++){
		lld im = fac*(n-i+1)%mod * inv(i+1);
		sum += im, sum%=mod;
	}
	printf("%lld", sum);
	return 0;
}
# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 1084 KB Output is correct
2 Correct 0 ms 1084 KB Output is correct
3 Correct 0 ms 1084 KB Output is correct
4 Correct 0 ms 1084 KB Output is correct
5 Correct 0 ms 1084 KB Output is correct
6 Correct 0 ms 1084 KB Output is correct
7 Correct 0 ms 1084 KB Output is correct
8 Correct 0 ms 1084 KB Output is correct
9 Correct 0 ms 1084 KB Output is correct
10 Correct 0 ms 1084 KB Output is correct
11 Correct 0 ms 1084 KB Output is correct
12 Correct 0 ms 1084 KB Output is correct
13 Correct 0 ms 1084 KB Output is correct
14 Correct 0 ms 1084 KB Output is correct
15 Correct 0 ms 1084 KB Output is correct
16 Correct 0 ms 1084 KB Output is correct
17 Correct 0 ms 1084 KB Output is correct
18 Correct 0 ms 1084 KB Output is correct
19 Correct 0 ms 1084 KB Output is correct
20 Correct 0 ms 1084 KB Output is correct
21 Correct 0 ms 1084 KB Output is correct
22 Correct 0 ms 1084 KB Output is correct
23 Correct 0 ms 1084 KB Output is correct
24 Correct 0 ms 1084 KB Output is correct
25 Correct 0 ms 1084 KB Output is correct
26 Correct 0 ms 1084 KB Output is correct
27 Correct 0 ms 1084 KB Output is correct
28 Correct 0 ms 1084 KB Output is correct
29 Correct 0 ms 1084 KB Output is correct
30 Correct 0 ms 1084 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 340 ms 1084 KB Output is correct
2 Correct 115 ms 1084 KB Output is correct
3 Correct 47 ms 1084 KB Output is correct
4 Correct 27 ms 1084 KB Output is correct
5 Correct 45 ms 1084 KB Output is correct
6 Correct 34 ms 1084 KB Output is correct
7 Correct 273 ms 1084 KB Output is correct
8 Correct 163 ms 1084 KB Output is correct
9 Correct 56 ms 1084 KB Output is correct
10 Correct 9 ms 1084 KB Output is correct
11 Correct 114 ms 1084 KB Output is correct
12 Correct 6 ms 1084 KB Output is correct
13 Correct 55 ms 1084 KB Output is correct
14 Correct 237 ms 1084 KB Output is correct
15 Correct 138 ms 1084 KB Output is correct
16 Correct 216 ms 1084 KB Output is correct
17 Correct 103 ms 1084 KB Output is correct
18 Correct 96 ms 1084 KB Output is correct
19 Correct 22 ms 1084 KB Output is correct
20 Correct 125 ms 1084 KB Output is correct
21 Correct 80 ms 1084 KB Output is correct
22 Correct 205 ms 1084 KB Output is correct
23 Correct 78 ms 1084 KB Output is correct
24 Correct 40 ms 1084 KB Output is correct
25 Correct 45 ms 1084 KB Output is correct
26 Correct 142 ms 1084 KB Output is correct
27 Correct 15 ms 1084 KB Output is correct
28 Correct 9 ms 1084 KB Output is correct
29 Correct 381 ms 1084 KB Output is correct
30 Correct 381 ms 1084 KB Output is correct