Create 15654_N과 M (5).java

15654_N과 M (5).java

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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+
+public class Main {
+    static int N, M;
+    static int[] arr;
+    static ArrayList<Integer> list = new ArrayList<>();
+    static boolean[] v; //방문배열
+    static StringBuilder sb = new StringBuilder(); //안쓰면 시간초과
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        N = Integer.parseInt(st.nextToken() );
+        M = Integer.parseInt(st.nextToken() );
+
+        st = new StringTokenizer(br.readLine());
+        for(int i=0; i<N; i++) { //입력값 리스트 추가
+            list.add(Integer.parseInt(st.nextToken()));
+        }
+
+        Collections.sort(list); //오름차순 정렬
+
+        arr = new int[M];
+        v = new boolean[10055];
+
+        Perm(0);
+        System.out.println(sb);
+    }
+
+    private static void Perm(int cnt) {
+        if(cnt == M) {
+            //출력
+            for(int i=0; i<arr.length; i++) {
+                sb.append(arr[i] + " ");
+            }
+            sb.append("\n");
+        } else {
+            for(int i=0; i<list.size(); i++) {
+                int idx = list.get(i);
+                if(!v[idx]) { //방문 검사
+                    v[idx] = true;
+                    arr[cnt] = idx;
+                    Perm(cnt + 1);
+                    v[idx] = false;
+                }
+            }
+        }
+    }
+}