boj)15663 - N과 M (9)
2020. 11. 18. 14:16ㆍPS/boj
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import java.io.*;
import java.util.*;
public class boj_15663 {
static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
static StringTokenizer st;
static boolean[] v = new boolean[10];
static int[] a = new int[10];
static int[] val;
static int n, m;
public static void main(String[] args) throws IOException {
st = new StringTokenizer(br.readLine());
n = Integer.parseInt(st.nextToken());
m = Integer.parseInt(st.nextToken());
val = new int[n];
st = new StringTokenizer(br.readLine());
for (int i = 0; i < n; i++) {
val[i] = Integer.parseInt(st.nextToken());
}
Arrays.sort(val);
func(0);
bw.flush();
bw.close();
}
static void func(int k) throws IOException {
if (k == m) {
for (int i = 0; i < m; i++) {
bw.append(a[i] + " ");
}
bw.newLine();
return;
}
int before = 0;
for (int i = 0; i < n; i++) {
if (v[i]) continue;
if (i != 0 && before == val[i]) continue;
before = val[i];
a[k] = val[i];
v[i] = true;
func(k + 1);
v[i] = false;
}
}
}
|
cs |
- 백트래킹
- 중복값 처리를 해줘야해서 따로 변수 before을 만듬
- 매번 before 초기화 해주고 같으면 continue;
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