diff --git "a/Ukj0ng/202601/26 BOJ G4 \354\210\250\353\260\224\352\274\255\354\247\210 2.md" "b/Ukj0ng/202601/26 BOJ G4 \354\210\250\353\260\224\352\274\255\354\247\210 2.md" new file mode 100644 index 00000000..ff779003 --- /dev/null +++ "b/Ukj0ng/202601/26 BOJ G4 \354\210\250\353\260\224\352\274\255\354\247\210 2.md" @@ -0,0 +1,66 @@ +``` +import java.io.*; +import java.util.ArrayDeque; +import java.util.Arrays; +import java.util.Queue; +import java.util.StringTokenizer; + +public class Main { + private static final BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); + private static final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out)); + private static final int[] dx = {1, -1, 2}; + private static int[] visited; + private static int N, K; + + public static void main(String[] args) throws IOException { + init(); + int answer = BFS(N); + + bw.write(visited[K] + "\n"); + bw.write(answer + "\n"); + bw.flush(); + bw.close(); + br.close(); + } + + private static void init() throws IOException { + StringTokenizer st = new StringTokenizer(br.readLine()); + N = Integer.parseInt(st.nextToken()); + K = Integer.parseInt(st.nextToken()); + + visited = new int[100001]; + Arrays.fill(visited, Integer.MAX_VALUE); + } + + private static int BFS(int start) { + Queue q = new ArrayDeque<>(); + int result = 0; + visited[start] = 0; + q.add(new int[] {start, visited[start]}); + + while (!q.isEmpty()) { + int[] current = q.poll(); + + if (current[1] > visited[current[0]]) continue; + if (current[0] == K && visited[current[0]] == current[1]) { + result++; + } + + for (int i = 0; i < 3; i++) { + int nx = 0; + if (i == 2) { + nx = current[0]*dx[i]; + } else { + nx = current[0]+dx[i]; + } + if (nx < 0 || nx > 100000) continue; + if (visited[nx] < current[1]+1) continue; + visited[nx] = current[1]+1; + q.add(new int[] {nx, visited[nx]}); + } + } + + return result; + } +} +```