TLE。。。我学的只允许我用循环啊啊啊

#include<iostream>
using namespace std;
int main()
{
	int arr[9];
	for (int i = 123; i < 329; i++)
	{
		arr[0] = i / 100;
		arr[1] = i / 10 % 10;
		arr[2] = i % 10;
		for (int j = 246; j < 658; j++)
		{
			arr[3] = j / 100;
			arr[4] = j / 10 % 10;
			arr[5] = j % 10;
			for (int k = 369; k <= 987; k++)
			{
				arr[6] = k / 100;
				arr[7] = k / 10 % 10;
				arr[8] = k % 10;
				int num = 0;
				for (int m = 0; m < 9; m++)
				{
					for (int n = 0; n < 9; n++)
					{
						if (m != n && arr[m] == arr[n])
						{
							num += 1;
						}
						if (arr[m] == 0)num += 1;
					}
				}
				if (num == 0&&2*i==j&&3*i==k)cout << i << '\t' << j << '\t' << k<<endl;
			}
		}
	}
}