31 lines
495 B
C++
31 lines
495 B
C++
#include<cstdio>
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#include<cstring>
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__int64 d[1010][1010];
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int fun()
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{
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int i,j;
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memset(d,0,sizeof(d));
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for(i=1; i<=20; i++)
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{
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d[i][1]=i;
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}
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for(i=2; i<=20; i++)
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{
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for(j=2; j<=20; j++)
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{
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if(i>=j)
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d[i][j] = d[i][j-1]+d[i-1][j];
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}
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}
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}
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int main()
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{
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int m,n;
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fun();
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while(scanf("%d %d",&m,&n)!=EOF)
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{
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printf("%I64d\n",d[m][n]);
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}
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return 0;
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}
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