T!J!

谢谢你，输出样例。***。

#include<iostream>
using namespace std;
using T = long long;
T arr[21][21][21]{};
T w(T a,T b,T c){
    if(a < 1 || b < 1 || c < 1)return 1;
    if(a > 20 || b > 20 || c > 20)return 1048576;
    if(arr[a][b][c])return arr[a][b][c];
    if(a < b && b < c)return arr[a][b][c]=w(a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c);
    return arr[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);
}
int main(){
    T a{},b{},c{};
    while(1){
        cin >> a >> b >> c;
        if(a==-1&b==-1&c==-1)break;
        printf("w(%lld,%lld,%lld) =%lld\n",a,b,c,w(a,b,c));
    }
    return 0;
}