OJ-Problems-Source/HDOJ/1331_autoAC.cpp

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2016-08-13 23:51:27 +08:00
#include<iostream>
using namespace std;
int x[21][21][21]={0};
int w(int a,int b,int c)
{
if(a<=0||b<=0||c<=0)
return 1;
if(x[a][b][c]!=0)
return x[a][b][c];
if(a<b&&b<c)
{
x[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
return x[a][b][c];
}
else
{
x[a][b][c]=w(a-1,b,c)+w(a-1,b-1,c)+w(a-1,b,c-1)-w(a-1,b-1,c-1);
return x[a][b][c];
}
}
int main()
{
int a,b,c;
while(cin>>a>>b>>c&&!(a==-1&&b==-1&&c==-1))
{
if(a<=0||b<=0||c<=0)
{
printf("w(%d, %d, %d) = %d\n",a,b,c,1);
continue;
}
if(a>20||b>20||c>20)
printf("w(%d, %d, %d) = %d\n",a,b,c,w(20,20,20));
else
printf("w(%d, %d, %d) = %d\n",a,b,c,w(a,b,c));
}
return 0;
}