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w[i][j][k] = w[i][j][j-1] + w[i][j-1][k-1] - w[i][j-1][k];In Reply To:why WA? Posted by:PC0400322032 at 2004-06-26 17:41:37 > #include <stdio.h>
> void main(void)
> {
> int w[21][21][21];
> int a,b,c;
> int i,j,k;
> for(i=0;i<21;i++)
> for(j=0;j<21;j++)
> w[0][i][j] = w[i][0][j] = w[i][j][0] = 1;
> for(i=1;i<21;i++)
> for(j=1;j<21;j++)
> for(k=1;k<21;k++)
> {
> if((i<j)&&(j<k))
> w[i][j][k] = w[i][j][j-1] + w[i][j-1][k-1] - w[i][j-1][k];
> else
> w[i][j][k]=w[i-1][j][k]+w[i-1][j-1][k]+w[i-1][j][k-1]-w[i-1][j-1][k-1];
> }
> while(1)
> {
> scanf("%d %d %d",&a,&b,&c);
> i =a;j=b;k=c;
> if(a==-1 && b==-1 && c==-1)
> break;
> if(a<=0 || b<=0 || c<=0)
> i=j=k=0;
> if(a>20 || b>20 || c>20)
> i=j=k=20;
> printf("w(%d, %d, %d) = %d\n",a,b,c,w[i][j][k]);
> }
> }
>
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