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why WA?#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]); } } Followed by:
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