1331 function run fun.cpp

威士忌的HDU题解.大概有260多题的源码。对于学习非常有好处。

/*
1331 Function Run Fun
Time Limit : 1000 ms  Memory Limit : 32768 K  Output Limit : 256 K

GUN C++
*/
#include <iostream>
using namespace std;

const int Max=21;
int w[Max][Max][Max]={0};
bool v[Max][Max][Max]={false};

int solve(int a,int b,int c)
{
    int temp;
    
    if(a<=0 || b<=0 || c<=0)
        return 1;
    
    if(a>20  || b>20 || c>20)
        return solve(20,20,20);
        
    if(v[a][b][c])
        return w[a][b][c];
    else
    {
        if(a<b && b<c)
        {
            temp=solve(a, b, c-1) + solve(a, b-1, c-1) - solve(a, b-1, c);
            v[a][b][c]=true;
            w[a][b][c]=temp;
        }
        else
        {
            temp=solve(a-1, b, c) + solve(a-1, b-1, c) + solve(a-1, b, c-1) - solve(a-1, b-1, c-1);
            v[a][b][c]=true;
            w[a][b][c]=temp;
        }
        return temp;
    }
}

int main()
{
    int a,b,c,i,j,k;
        
    while(cin>>a>>b>>c && (a!=-1 || b!=-1 || c!=-1) )
    {
        cout<<"w("<<a<<", "<<b<<", "<<c<<") = "<<solve(a,b,c)<<endl;
    }
    return 0;
}