44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
#include<stdio.h>
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__int64 mmg[1005],n,k;
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__int64 C[1005][1000],flag[1005][1000];
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int main()
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{
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int i,j;
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while(scanf("%I64d%I64d",&n,&k)!=EOF)
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{
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C[1][0]=C[1][1]=1%k;
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flag[1][0]=flag[1][1]=(1/k)%2;
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for(i=2;i<=n;i++)
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{
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C[i][0]=C[i][i]=1%k;
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flag[i][0]=flag[i][i]=(1/k)%2;
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for(j=1;j<i;j++)
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{
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C[i][j]=(C[i-1][j]+C[i-1][j-1])%k;
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flag[i][j]=flag[i-1][j]+flag[i-1][j-1]+(C[i-1][j]+C[i-1][j-1])/k;
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flag[i][j]=flag[i][j]%2;
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}
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}
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mmg[1]=1%k;
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mmg[2]=1%k;
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for(i=3;i<=n;i++)
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{
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mmg[i]=mmg[i-1];
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for(j=1;j<=(i-1)/2;j++)
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{
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if(i-1==2*j)
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{
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if(flag[i-1][j]==1)
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mmg[i]+=(((mmg[j]%k)*(mmg[i-j-1]%k))%k)*(((C[i-1][j]+k)/2)%k);
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else
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mmg[i]+=(((mmg[j]%k)*(mmg[i-j-1]%k))%k)*(((C[i-1][j])/2)%k);
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}
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else
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mmg[i]+=(((mmg[j]%k)*(mmg[i-j-1]%k))%k)*(C[i-1][j]%k);
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mmg[i]=mmg[i]%k;
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}
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}
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printf("%I64d\n",mmg[n]);
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}
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}
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