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source code:
#include <cstdio> #define MAXN 21 int bw[MAXN][MAXN][MAXN]; void init() { int a,b,c; for(a=0;a<MAXN;a++) { for(b=0;b<MAXN;b++) { for(c=0;c<MAXN;c++) { if(a==0 || b==0 || c==0) { bw[a][b][c]=1; } else if(a<b && b<c) { bw[a][b][c] = bw[a][b][c-1] + bw[a][b-1][c-1] - bw[a][b-1][c]; } else { bw[a][b][c] = bw[a-1][b][c] + bw[a-1][b-1][c] + bw[a-1][b][c-1] - bw[a-1][b-1][c-1]; } }}} } int w(int a, int b, int c) { if(a<=0 || b<=0 || c<=0) { return 1; } if(a>20 || b>20 || c>20) { return w(20,20,20); } return bw[a][b][c]; } int main(void) { init(); int a,b,c; while (1) { scanf("%d%d%d",&a,&b,&c); if(a==-1 && b==-1 && c==-1) { break; } printf("w(%d, %d, %d) = %d\n",a,b,c,w(a,b,c)); } return 0; }
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