#include <bits/stdc++.h>
#define mp make_pair
#define pb push_back
#define X first
#define Y second
#define y0 y12
#define y1 y22
#define INF 987654321
#define PI 3.141592653589793238462643383279502884
#define fup(i,a,b,c) for(int (i)=(a);(i)<=(b);(i)+=(c))
#define fdn(i,a,b,c) for(int (i)=(a);(i)>=(b);(i)-=(c))
#define MEM0(a) memset((a),0,sizeof(a));
#define MEM_1(a) memset((a),-1,sizeof(a));
#define ALL(a) a.begin(),a.end()
#define SYNC ios_base::sync_with_stdio(false);cin.tie(0)
using namespace std;
typedef long long ll;
typedef long double ld;
typedef double db;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<int, int> Pi;
typedef pair<ll, ll> Pll;
typedef pair<ld, ld> Pd;
typedef vector<int> Vi;
typedef vector<ll> Vll;
typedef vector<ld> Vd;
typedef vector<Pi> VPi;
typedef vector<Pll> VPll;
typedef vector<Pd> VPd;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef tuple<ll, ll, ll> LLL;
typedef vector<iii> Viii;
typedef vector<LLL> VLLL;
typedef complex<double> base;
const int MOD = 1000000007;
ll POW(ll a, ll b, ll MMM = MOD) { ll ret = 1; for (; b; b >>= 1, a = (a*a) % MMM)if (b & 1)ret = (ret*a) % MMM; return ret; }
ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
ll lcm(ll a, ll b) { if (a == 0 || b == 0)return a + b; return a*(b / gcd(a, b)); }
int dx[] = { 0,1,0,-1,1,1,-1,-1 }, dy[] = { 1,0,-1,0,1,-1,1,-1 };
int ddx[] = { -1,-2,1,-2,2,-1,2,1 }, ddy[] = { -2,-1,-2,1,-1,2,1,2 };
ll d[3001][3001];
int n,k;
ll go(int N,int K)
{
if(K==1||K==N)return 1;
ll &ret=d[N][K];
if(~ret)return ret;
return ret=(go(N-1,K)*K+go(N-1,K-1)*(N-K+1))%MOD;
}
int main() {
MEM_1(d);
scanf("%d%d",&n,&k);
printf("%lld",go(n,k));
}
Compilation message
asceticism.cpp: In function 'int main()':
asceticism.cpp:55:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d",&n,&k);
~~~~~^~~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
41 ms |
70776 KB |
Output is correct |
2 |
Correct |
41 ms |
70776 KB |
Output is correct |
3 |
Correct |
39 ms |
70776 KB |
Output is correct |
4 |
Correct |
41 ms |
70776 KB |
Output is correct |
5 |
Correct |
41 ms |
70776 KB |
Output is correct |
6 |
Correct |
41 ms |
70776 KB |
Output is correct |
7 |
Correct |
41 ms |
70776 KB |
Output is correct |
8 |
Correct |
41 ms |
70904 KB |
Output is correct |
9 |
Correct |
41 ms |
70776 KB |
Output is correct |
10 |
Correct |
40 ms |
70776 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
41 ms |
70776 KB |
Output is correct |
2 |
Correct |
41 ms |
70776 KB |
Output is correct |
3 |
Correct |
39 ms |
70776 KB |
Output is correct |
4 |
Correct |
41 ms |
70776 KB |
Output is correct |
5 |
Correct |
41 ms |
70776 KB |
Output is correct |
6 |
Correct |
41 ms |
70776 KB |
Output is correct |
7 |
Correct |
41 ms |
70776 KB |
Output is correct |
8 |
Correct |
41 ms |
70904 KB |
Output is correct |
9 |
Correct |
41 ms |
70776 KB |
Output is correct |
10 |
Correct |
40 ms |
70776 KB |
Output is correct |
11 |
Correct |
40 ms |
70776 KB |
Output is correct |
12 |
Correct |
41 ms |
70904 KB |
Output is correct |
13 |
Correct |
40 ms |
70860 KB |
Output is correct |
14 |
Correct |
42 ms |
70904 KB |
Output is correct |
15 |
Correct |
42 ms |
70776 KB |
Output is correct |
16 |
Correct |
41 ms |
70776 KB |
Output is correct |
17 |
Correct |
41 ms |
70776 KB |
Output is correct |
18 |
Correct |
41 ms |
70776 KB |
Output is correct |
19 |
Correct |
40 ms |
70776 KB |
Output is correct |
20 |
Correct |
41 ms |
70776 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
41 ms |
70776 KB |
Output is correct |
2 |
Correct |
41 ms |
70776 KB |
Output is correct |
3 |
Correct |
39 ms |
70776 KB |
Output is correct |
4 |
Correct |
41 ms |
70776 KB |
Output is correct |
5 |
Correct |
41 ms |
70776 KB |
Output is correct |
6 |
Correct |
41 ms |
70776 KB |
Output is correct |
7 |
Correct |
41 ms |
70776 KB |
Output is correct |
8 |
Correct |
41 ms |
70904 KB |
Output is correct |
9 |
Correct |
41 ms |
70776 KB |
Output is correct |
10 |
Correct |
40 ms |
70776 KB |
Output is correct |
11 |
Correct |
40 ms |
70776 KB |
Output is correct |
12 |
Correct |
41 ms |
70904 KB |
Output is correct |
13 |
Correct |
40 ms |
70860 KB |
Output is correct |
14 |
Correct |
42 ms |
70904 KB |
Output is correct |
15 |
Correct |
42 ms |
70776 KB |
Output is correct |
16 |
Correct |
41 ms |
70776 KB |
Output is correct |
17 |
Correct |
41 ms |
70776 KB |
Output is correct |
18 |
Correct |
41 ms |
70776 KB |
Output is correct |
19 |
Correct |
40 ms |
70776 KB |
Output is correct |
20 |
Correct |
41 ms |
70776 KB |
Output is correct |
21 |
Correct |
40 ms |
70904 KB |
Output is correct |
22 |
Correct |
40 ms |
70904 KB |
Output is correct |
23 |
Correct |
43 ms |
70904 KB |
Output is correct |
24 |
Correct |
47 ms |
70904 KB |
Output is correct |
25 |
Correct |
41 ms |
70904 KB |
Output is correct |
26 |
Correct |
42 ms |
70904 KB |
Output is correct |
27 |
Correct |
40 ms |
70780 KB |
Output is correct |
28 |
Correct |
43 ms |
70908 KB |
Output is correct |
29 |
Correct |
40 ms |
70776 KB |
Output is correct |
30 |
Correct |
41 ms |
70904 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
41 ms |
70776 KB |
Output is correct |
2 |
Correct |
41 ms |
70776 KB |
Output is correct |
3 |
Correct |
39 ms |
70776 KB |
Output is correct |
4 |
Correct |
41 ms |
70776 KB |
Output is correct |
5 |
Correct |
41 ms |
70776 KB |
Output is correct |
6 |
Correct |
41 ms |
70776 KB |
Output is correct |
7 |
Correct |
41 ms |
70776 KB |
Output is correct |
8 |
Correct |
41 ms |
70904 KB |
Output is correct |
9 |
Correct |
41 ms |
70776 KB |
Output is correct |
10 |
Correct |
40 ms |
70776 KB |
Output is correct |
11 |
Correct |
40 ms |
70776 KB |
Output is correct |
12 |
Correct |
41 ms |
70904 KB |
Output is correct |
13 |
Correct |
40 ms |
70860 KB |
Output is correct |
14 |
Correct |
42 ms |
70904 KB |
Output is correct |
15 |
Correct |
42 ms |
70776 KB |
Output is correct |
16 |
Correct |
41 ms |
70776 KB |
Output is correct |
17 |
Correct |
41 ms |
70776 KB |
Output is correct |
18 |
Correct |
41 ms |
70776 KB |
Output is correct |
19 |
Correct |
40 ms |
70776 KB |
Output is correct |
20 |
Correct |
41 ms |
70776 KB |
Output is correct |
21 |
Correct |
40 ms |
70904 KB |
Output is correct |
22 |
Correct |
40 ms |
70904 KB |
Output is correct |
23 |
Correct |
43 ms |
70904 KB |
Output is correct |
24 |
Correct |
47 ms |
70904 KB |
Output is correct |
25 |
Correct |
41 ms |
70904 KB |
Output is correct |
26 |
Correct |
42 ms |
70904 KB |
Output is correct |
27 |
Correct |
40 ms |
70780 KB |
Output is correct |
28 |
Correct |
43 ms |
70908 KB |
Output is correct |
29 |
Correct |
40 ms |
70776 KB |
Output is correct |
30 |
Correct |
41 ms |
70904 KB |
Output is correct |
31 |
Correct |
41 ms |
70776 KB |
Output is correct |
32 |
Runtime error |
129 ms |
143352 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
33 |
Halted |
0 ms |
0 KB |
- |