oj.uz

답안 #20027

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
20027 2016-02-25T08:42:25 Z cki86201 순열 (kriii4_T) C++14
100 / 100
 260 ms 1720 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <math.h>
#include <assert.h>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <string>
#include <algorithm>
#include <iostream>
#include <functional>
#include <unordered_map>
#include <unordered_set>

using namespace std;
typedef long long ll;
typedef pair<int, int> Pi;
#define Fi first
#define Se second
#define pb(x) push_back(x)
#define sz(x) (int)x.size()
#define rep(i,n) for(int i=0;i<n;i++)
#define all(x) x.begin(),x.end()

const ll MOD = 1e9 + 7;

ll pw(ll x, ll y){
	ll res = 1;
	while(y){
		if(y & 1)res = res * x % MOD;
		x = x * x % MOD;
		y >>= 1;
	}
	return res;
}

int main(){
	ll f = 1;
	int n, k;
	scanf("%d%d", &n, &k);
	if(n == k){
		printf("0");
		return 0;
	}
	for(int i=1;i<=n+1;i++)f = i * f % MOD;
	ll s = 0;
	for(int i=k+1;i<=n;i++){
		s += (n+1-i) * pw(i+1, MOD-2);
		s %= MOD;
	}
	f = f * s % MOD;
	printf("%lld", f);
	return 0;
}

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 1720 KB Output is correct
2 Correct 0 ms 1720 KB Output is correct
3 Correct 0 ms 1720 KB Output is correct
4 Correct 0 ms 1720 KB Output is correct
5 Correct 0 ms 1720 KB Output is correct
6 Correct 0 ms 1720 KB Output is correct
7 Correct 0 ms 1720 KB Output is correct
8 Correct 0 ms 1720 KB Output is correct
9 Correct 0 ms 1720 KB Output is correct
10 Correct 0 ms 1720 KB Output is correct
11 Correct 0 ms 1720 KB Output is correct
12 Correct 0 ms 1720 KB Output is correct
13 Correct 0 ms 1720 KB Output is correct
14 Correct 0 ms 1720 KB Output is correct
15 Correct 0 ms 1720 KB Output is correct
16 Correct 0 ms 1720 KB Output is correct
17 Correct 0 ms 1720 KB Output is correct
18 Correct 0 ms 1720 KB Output is correct
19 Correct 0 ms 1720 KB Output is correct
20 Correct 0 ms 1720 KB Output is correct
21 Correct 0 ms 1720 KB Output is correct
22 Correct 0 ms 1720 KB Output is correct
23 Correct 0 ms 1720 KB Output is correct
24 Correct 0 ms 1720 KB Output is correct
25 Correct 0 ms 1720 KB Output is correct
26 Correct 0 ms 1720 KB Output is correct
27 Correct 0 ms 1720 KB Output is correct
28 Correct 0 ms 1720 KB Output is correct
29 Correct 0 ms 1720 KB Output is correct
30 Correct 0 ms 1720 KB Output is correct

Subtask #2
92.0 / 92.0

# 결과 실행 시간 메모리 Grader output
1 Correct 231 ms 1720 KB Output is correct
2 Correct 79 ms 1720 KB Output is correct
3 Correct 34 ms 1720 KB Output is correct
4 Correct 21 ms 1720 KB Output is correct
5 Correct 31 ms 1720 KB Output is correct
6 Correct 25 ms 1720 KB Output is correct
7 Correct 186 ms 1720 KB Output is correct
8 Correct 112 ms 1720 KB Output is correct
9 Correct 39 ms 1720 KB Output is correct
10 Correct 3 ms 1720 KB Output is correct
11 Correct 77 ms 1720 KB Output is correct
12 Correct 8 ms 1720 KB Output is correct
13 Correct 39 ms 1720 KB Output is correct
14 Correct 161 ms 1720 KB Output is correct
15 Correct 94 ms 1720 KB Output is correct
16 Correct 147 ms 1720 KB Output is correct
17 Correct 67 ms 1720 KB Output is correct
18 Correct 66 ms 1720 KB Output is correct
19 Correct 13 ms 1720 KB Output is correct
20 Correct 86 ms 1720 KB Output is correct
21 Correct 55 ms 1720 KB Output is correct
22 Correct 140 ms 1720 KB Output is correct
23 Correct 55 ms 1720 KB Output is correct
24 Correct 27 ms 1720 KB Output is correct
25 Correct 32 ms 1720 KB Output is correct
26 Correct 94 ms 1720 KB Output is correct
27 Correct 11 ms 1720 KB Output is correct
28 Correct 6 ms 1720 KB Output is correct
29 Correct 259 ms 1720 KB Output is correct
30 Correct 260 ms 1720 KB Output is correct