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happyZYM
2023-08-03 09:22:52 +08:00
commit de60cd6ed4
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1.2822.cpp Normal file
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#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
const int maxn=2005;
int t,k,n,m;
int C[maxn][maxn],d[maxn][maxn],sum[maxn][maxn];
int main()
{
#ifdef local
freopen("pro.in","r",stdin);
#endif
scanf("%d%d",&t,&k);
n=2000;
for(int i=0;i<=n;i++) C[i][0]=1;
for(int i=1;i<=n;i++)
for(int j=1;j<=i;j++)
C[i][j]=(C[i-1][j-1]+C[i-1][j])%k;
for(int i=0;i<=n;i++)
for(int j=0;j<=i;j++)
d[i][j]=(C[i][j]%k==0);
for(int i=0;i<=n;i++)
for(int j=0;j<=n;j++)
sum[i][j]=d[i][j]+(i>0?sum[i-1][j]:0)+(j>0?sum[i][j-1]:0)-(i>0&&j>0?sum[i-1][j-1]:0);
while(t-->0)
{
scanf("%d%d",&n,&m);
printf("%d\n",sum[n][m]);
}
return 0;
}