#include <iostream>
#include<algorithm>
#include<vector>
using namespace std;
//算法：https://blog.csdn.net/wumuzi520/article/details/8087501#comments 
void Combination(int arr[], int nLen, int m, int out[], int outLen)
{
	if(m == 0)
	{
		for (int j = 0; j < outLen; j++)
			cout << out[j] << "\t";
		cout << endl;
 
		return;
	}
 
	for (int i = nLen; i >= m; --i)	//从后往前依次选定一个
	{
		out[m-1] = arr[i-1]; //选定一个后
		Combination(arr,i-1,m-1,out,outLen); // 从前i-1个里面选取m-1个进行递归
	}
}
void PrintCombination(int arr[], int nLen, int m)
{
	if(m > nLen)
		return;
 
	int* out = new int[m];
	Combination(arr,nLen,m,out,m);
	delete [] out;
}

int main() {
	int array[] = { 1,2,3,4,5,6};
	PrintCombination(array,6,3); 
	return 0;
}