[20250724] BOJ / G4 / 숨바꼭질 4 / 이준희

Author: JHLEE325

JHLEE325/202507/24 BOJ G4 숨바꼭질 4.md

@@ -0,0 +1,64 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    static int MAX = 100001;
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        int n = Integer.parseInt(st.nextToken());
+        int k = Integer.parseInt(st.nextToken());
+
+        int[] dist = new int[MAX];
+        int[] prev = new int[MAX];
+
+        Arrays.fill(dist, -1);
+
+        Queue<Integer> q = new LinkedList<>();
+        q.offer(n);
+        dist[n] = 0;
+
+        while (!q.isEmpty()) {
+            int now = q.poll();
+
+            for (int i = 0; i < 3; i++) {
+                int next = 0;
+                switch (i) {
+                    case 0:
+                        next = now - 1;
+                        break;
+                    case 1:
+                        next = now + 1;
+                        break;
+                    case 2:
+                        next = now * 2;
+                        break;
+                }
+
+                if (next >= 0 && next < MAX && dist[next] == -1) {
+                    dist[next] = dist[now] + 1;
+                    prev[next] = now;
+                    q.offer(next);
+                }
+            }
+
+        }
+
+        System.out.println(dist[k]);
+
+        Stack<Integer> path = new Stack<>();
+        for (int i = k; i != n; i = prev[i]) {
+            path.push(i);
+        }
+        path.push(n);
+
+        while (!path.isEmpty()) {
+            System.out.print(path.pop() + " ");
+        }
+    }
+}
+
+```