#include #include using namespace std; typedef long long ll; //手懒得打long long

ll a,b,c,note[30][30][30] = {0}; //记忆初始化，记得都要用ll哦

ll w(ll i,ll j,ll k){ if(i<=0||j<=0||k<=0) return 1; //第一种情况 if(i>20||j>20||k>20) return w(20,20,20);//第二种 if(i<j&&j<k){//第三种 if(note[i][j][k-1] == 0){//是否有记忆 note[i][j][k-1] = w(i,j,k-1); } if(note[i][j-1][k-1] == 0){ note[i][j-1][k-1] = w(i,j-1,k-1); } if(note[i][j-1][k] == 0){ note[i][j-1][k] = w(i,j-1,k); } note[i][j][k] = note[i][j][k-1] + note[i][j-1][k-1] - note[i][j-1][k]; //返回 } else{//其他情况 if(note[i-1][j][k] == 0){ note[i-1][j][k] = w(i-1,j,k); } if(note[i-1][j-1][k] == 0){ note[i-1][j-1][k] = w(i-1,j-1,k); } if(note[i-1][j][k-1] == 0){ note[i-1][j][k-1] = w(i-1,j,k-1); } if(note[i-1][j-1][k-1] == 0){ note[i-1][j-1][k-1] = w(i-1,j-1,k-1); } note[i][j][k] = note[i-1][j][k] + note[i-1][j-1][k] + note[i-1][j][k-1] - note[i-1][j-1][k-1]; } return note[i][j][k];//结束 } int main(){ while(1){ cin>>a>>b>>c; if(a==-1&&b==-1&&c==-1) return 0; cout<<"w("<<a<<", "<<b<<", "<<c<<')'<<" = "<<w(a,b,c)<<endl; } }