47 lines
1.0 KiB
C++
47 lines
1.0 KiB
C++
#include <iostream>
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#include <cstring>
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#include <cstdio>
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using namespace std;
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int w[23][23][23];
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int get(int i,int j,int k)
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{
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if(w[i][j][k]!=-1)
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return w[i][j][k];
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if(i<=0||j<=0||k<=0) return 1;
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if(i>=20||j>=20||k>=20) return 1048576;
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if(i<j&&j<k)
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{
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return get(i,j,k-1)+get(i,j-1,k-1)-get(i,j-1,k);
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}
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else
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{
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return get(i-1,j,k)+get(i-1,j-1,k)+get(i-1,j,k-1)-get(i-1,j-1,k-1);
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}
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}
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int main()
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{
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memset(w,-1,sizeof(w));
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w[0][0][0]=1;
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for(int i=0;i<=21;i++)
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{
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for(int j=0;j<=21;j++)
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{
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for(int k=0;k<=21;k++)
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{
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w[i][j][k]=get(i,j,k);
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}
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}
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}
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int a,b,c;
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while(cin>>a>>b>>c)
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{
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if(a==-1&&b==-1&&c==-1) break;
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printf("w(%d, %d, %d) = ",a,b,c);
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if(a<=0||b<=0||c<=0) printf("%d\n",w[0][0][0]);
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else if(a>20||b>20||c>20) printf("%d\n",w[20][20][20]);
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else
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printf("%d\n",w[a][b][c]);
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}
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return 0;
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}
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