1 #2 WA

3---#7 TLE

#include<bits/stdc++.h>
using namespace std;
long long w(int a,int b,int 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(a<b&&b<c)return w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
    else return w(a-1,b,c)+w(a-1,b-1,c)+w(a-1,b,c-1)-w(a-1,b-1,c-1);
}
int main()
{
    int a,b,c;
    while(cin>>a>>b>>c){
        if(a==-1&&b==-1&&c==-1)break;
        cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<<w(a,b,c)<<"\n";
    }
    return 0;
}

求助,样例过了!