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w[i][j][k] = w[i][j][j-1] + w[i][j-1][k-1] - w[i][j-1][k];

Posted by bdwyg at 2006-08-16 16:51:43 on Problem 1579
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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