27 lines
520 B
C++
27 lines
520 B
C++
#include <iostream>
|
|
#include <cstdio>
|
|
#include <cstring>
|
|
using namespace std;
|
|
int dp[110][110];
|
|
int main()
|
|
{
|
|
memset(dp, 0, sizeof(dp));
|
|
for(int i=1; i<=100; i++)
|
|
{
|
|
dp[i][0] = dp[i][i-1] = 1;
|
|
}
|
|
for(int i=1; i<=100; i++)
|
|
{
|
|
for(int j=1; j<=100; j++)
|
|
{
|
|
dp[i][j] = (dp[i-1][j]*(j+1) + dp[i-1][j-1]*(i-j)) % 2009;
|
|
}
|
|
}
|
|
int n,k;
|
|
while(scanf("%d %d",&n,&k) != EOF)
|
|
{
|
|
cout<<dp[n][k]<<endl;
|
|
}
|
|
return 0;
|
|
}
|