Function Run Fun(AC)

#include<iostream>
using namespace std;

int main()
{
    int array[21][21][21];

    for (int i=0; i<=20; i++)
    {
        for (int j=0; j<=20; j++)
        {
            for (int k=0; k<=20; k++)
            {
                if (i == 0 || j == 0 || k == 0)
                {
                    array[i][j][k] = 1;
                }
            }
        }
    }
    for (int i=1; i<=20; i++)
    {
        for (int j=1; j<=20; j++)
        {
            for (int k=1; k<=20; k++)
            {
                if (i < j && j < k)
                {
                    array[i][j][k] = array[i][j][k-1] + array[i][j-1][k-1]
                                     - array[i][j-1][k];
                }
                else
                {
                    array[i][j][k] = array[i-1][j][k] + array[i-1][j-1][k]
                                     + array[i-1][j][k-1] - array[i-1][j-1][k-1];
                }
            }
        }
    }
    int a, b, c;
    cin >> a >> b >> c;
    while (!(a == -1 && b == -1 && c == -1))
    {
        cout << "w" << "(" << a << ", " << b << ", " << c << ")" << " = ";
        if (a <= 0 || b <= 0 || c <= 0)
        {
            cout << "1" << endl;
        }
        else if (a > 20 || b > 20 || c > 20)
        {
            cout << "1048576" << endl;
        }
        else
        {
            cout << array[a][b][c] << endl;
        }
        cin >> a >> b >> c;
    }
    return 0;
}

　　一开始提交时有错，参考了一下http://www.cppblog.com/hunter/archive/2008/11/16/67046.aspx，把 while 循环的前两个 if 语句换了位置就对了。