[20250617] BOJ / G4 / 숨바꼭질 2 / 김수연

suyeun84/202506/17 BOJ G4 숨바꼭질 2.md

@@ -0,0 +1,49 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj12851 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static StringTokenizer st;
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+
+	static int N, K;
+	static int minTime = Integer.MAX_VALUE;
+	static int cnt = 0;
+	static int[] visited = new int[100001];
+	public static void main(String[] args) throws Exception {
+		nextLine();
+		N = nextInt();
+		K = nextInt();
+		bfs();
+		System.out.println(minTime);
+		System.out.println(cnt);
+	}
+
+	static void bfs() {
+		Queue<Integer> q = new LinkedList<>();
+		q.add(N);
+		visited[N] = 1;
+		while (!q.isEmpty()) {
+			int curr = q.poll();
+			int time = visited[curr];
+			if (curr == K) {
+				if (time-1 < minTime) {
+					minTime = time-1;
+					cnt = 1;
+				} else if (time-1 == minTime) cnt++;
+				continue;
+			}
+			for (int next : new int[] {curr-1, curr+1, curr*2}) {
+				if (next < 0 || next > 100000) continue;
+
+				if (visited[next] == 0 || visited[next] == time+1) {
+					visited[next] = time+1;
+					q.add(next);
+				}
+			}
+		}
+	}
+}
+```