3496. 鸡兔同笼

3496. 鸡兔同笼

Description

一个笼中有x只鸡和y只兔（x和y可以为0）. 它们总共有m个头和n只脚（0 <= m, n <= 10000）. 从键盘读入m和n的值，从屏幕输出x和y的值. 如果无解，则输出No answer.

Input

有多组输入数据. 输入数据的每行是两个整数m和n. m和n都为0表示输入结束（不需要处理这一行）.

Output

对于每组输入数据，输出x和y的值，x和y之间用空格隔开. 如果无解，则输出No answer.

Sample Input

5 16
3 15
0 0

Sample Output

2 3
No answer

Problem Source

林瀚

// source code of submission 962912, Zhongshan University Online Judge System
#include <iostream>
using namespace std;

int main ()
{
    int m,n,a,b;
    while (cin >> m >> n)
    {
        if (m == 0 && n == 0)
            return 0;
        else
        {
            a = 2*m - n/2;
            b = n/2 - m;
            if ( a < 0 || b < 0 || n%2 != 0)
                cout << "No answer" <<endl;
            else 
                cout << a << " " << b << endl;
        }
    }
    return 0;
}