BCTOHOP - Sinh tổ hợp (Cơ bản)

#include "bits/stdc++.h"
using namespace std;
int main()
{
	int n, k;
	cin >> n >> k;
	int a[k + 1];
	for (int i = 1; i <= k; i++)
		a[i] = i;
	while (1)
	{
		int ok = 0;
		for (int i = 1; i <= k; i++)
			cout << a[i] << " ";
		cout << endl;
		for (int i = k; i >= 1; i--)
		{
			if (a[i] != n - k + i)
			{
				ok = 1;
				a[i]++;
				for (int j = i + 1; j <= k; j++)
					a[j] = a[j - 1] + 1;
				break;
			}
		}
		if (ok == 0)
			break;
	}
}