关于#c++#的问题：求方程偶数解

Question

求方程5x+6y=M的正整数解中x和y都是整数的解，只有M和N都是正整数时，且x，y范围为[1,N].

Answer 1

#include <iostream>
using namespace std;

void main(){
    int f(int M, int N);
    cout << f(500, 650) << endl;
}

int f(int M, int N)
{
    //5x+6y=M
    int i, j, count = 0;
    if(M <= 0 || N <= 0)
        return -1;
    for(i = 1; i <= N; ++i)
    {
        for(j = 1; j <= N; ++j)
        {
            if (5 * i + 6 * j == M)
            {
                cout<< i<<"\t"<< j<<endl;
                ++count;
            }
        }
    }
    return count;
}