[백준,c++] 15655번 - N과 M (6)

문제

https://www.acmicpc.net/problem/15655

15655번: N과 M (6)

 

코드

#include <iostream>
#include <vector>
#include <algorithm>
#define max 9
using namespace std;

int N, M;
int arr[max];
bool visited[max];
vector<int>v;

void dfs(int num,int start) {
	if (start == M) {
		for (int i = 0; i < M; i++) {
			cout << arr[i] << " ";
		}
		cout << "\n";
	}
	else {
		for (int i = num; i <= N; i++) {
			if (!visited[i]) {
				visited[i] = true;
				arr[start] = v[i-1];
				dfs(i,start + 1);
				visited[i] = false;
			}
		}
	}
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(0);

	cin >> N >> M;
	for (int i = 0; i < N; i++) {
		int num; cin >> num;
		v.push_back(num);
	}
	sort(v.begin(), v.end());
	dfs(1,0);
}