0pts求助

#include<bits/stdc++.h>
using namespace std;
long long t[25][25][25];
int w(long long a,long long b,long long c)
{
    if(a<=0||b<=0||c<=0)return 1;
    else if(a>20||b>20||c>20)return w(20,20,20);
    else if(w[a][b][c])return t[a][b][c];
    else if(a<b<c)return w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
    else t[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 t[a][b][c];
}
int main()
{
    long long x,y,z;
    while(1)
    {
        cin>>x>>y>>z;
        if(x==-1&&y==-1&&z==-1)break;
        cout<<"w("<<x<<", "<<y<<", "<<z<<") = "<<w(x,y,z)<<endl;
    }
    return 0;
}

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