백준 15663번: N과 M(9)

N과 M(9)
 
함수딸깍

#include <bits/stdc++.h>
using namespace std;

#define endl "\n"
#define FOR(i, N) for (int i = 0; i < static_cast<int>(N); i++)

int N, M;
vector<int> arr;

int main() {
	cin.tie(NULL)->sync_with_stdio(false);
	cin >> N >> M;
	FOR(i, N) {
		int num; cin >> num;
		arr.push_back(num);
	}
	sort(arr.begin(), arr.end());

	do {
		FOR(i, M) cout << arr[i] << " "; cout << endl;
		reverse(arr.begin() + M, arr.end());
	} while (next_permutation(arr.begin(), arr.end()));

	return 0;
}