[minzino]0223 bj15686 치킨배달 실패

minzino/java/src/main/java/org/example/feb/bj15650/Main.java

@@ -0,0 +1,41 @@
+package main.java.org.example.feb.bj15650;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.StringTokenizer;
+
+public class Main {
+    private static int n, m;
+    private static int[] arr;
+    private static StringBuilder sb = new StringBuilder();
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static StringTokenizer st;
+
+    public static void main(String[] args) throws IOException {
+        st = new StringTokenizer(br.readLine());
+
+        n = Integer.parseInt(st.nextToken());
+        m = Integer.parseInt(st.nextToken());
+
+        arr = new int[m];
+
+        dfs(1, 0);
+        System.out.println(sb);
+    }
+
+    private static void dfs(int at, int depth) {
+        if (depth == m) {
+            for (int val : arr) {
+                sb.append(val).append(" ");
+            }
+            sb.append("\n");
+            return;
+        }
+
+        for (int i = at; i <= n; i++) {
+            arr[depth] = i;
+            dfs(i + 1, depth + 1);
+        }
+    }
+}

minzino/java/src/main/java/org/example/feb/bj15686/Main.java

@@ -0,0 +1,95 @@
+package main.java.org.example.feb.bj15686;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.util.ArrayList;
+import java.util.StringTokenizer;
+
+class Point {
+    int x;
+    int y;
+
+    Point(int x, int y) {
+        this.x = x;
+        this.y = y;
+    }
+}
+
+public class Main {
+    static int N, M;
+    static int[][] map;
+    static ArrayList<Point> person;
+    static ArrayList<Point> chicken;
+    static int ans;
+    static boolean[] open;
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        N = Integer.parseInt(st.nextToken());
+        M = Integer.parseInt(st.nextToken());
+
+        map = new int[N][N];
+        person = new ArrayList<>();
+        chicken = new ArrayList<>();
+
+        // 미리 집과 치킨집에 해당하는 좌표를 ArrayList에 넣어 둠.
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            for (int j = 0; j < N; j++) {
+                map[i][j] = Integer.parseInt(st.nextToken());
+
+                if (map[i][j] == 1) {
+                    person.add(new Point(i, j));
+                } else if (map[i][j] == 2) {
+                    chicken.add(new Point(i, j));
+                }
+            }
+        }
+
+        ans = Integer.MAX_VALUE;
+        open = new boolean[chicken.size()];
+
+        DFS(0, 0);
+        bw.write(ans + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    public static void DFS(int start, int cnt) {
+        if (cnt == M) {
+            int res = 0;
+
+            for (int i = 0; i < person.size(); i++) {
+                int temp = Integer.MAX_VALUE;
+
+                // 어떤 집과 치킨집 중 open한 치킨집의 모든 거리를 비교한다.
+                // 그 중, 최소 거리를 구한다.
+                for (int j = 0; j < chicken.size(); j++) {
+                    if (open[j]) {
+                        int distance = Math.abs(person.get(i).x - chicken.get(j).x)
+                                + Math.abs(person.get(i).y - chicken.get(j).y);
+
+                        temp = Math.min(temp, distance);
+                    }
+                }
+                res += temp;
+            }
+            ans = Math.min(ans, res);
+            return;
+        }
+
+        // 백트래킹
+        for (int i = start; i < chicken.size(); i++) {
+            open[i] = true;
+            DFS(i + 1, cnt + 1);
+            open[i] = false;
+        }
+    }
+
+}