diff --git "a/zinnnn37/202601/24 BOJ P4 \355\203\210\354\230\245.md" "b/zinnnn37/202601/24 BOJ P4 \355\203\210\354\230\245.md" new file mode 100644 index 00000000..0660b4e3 --- /dev/null +++ "b/zinnnn37/202601/24 BOJ P4 \355\203\210\354\230\245.md" @@ -0,0 +1,142 @@ +```java +import java.io.*; +import java.util.ArrayDeque; +import java.util.Arrays; +import java.util.Deque; +import java.util.StringTokenizer; + +public class BJ_9376_탈옥 { + + private static final int INF = 10001; + private static final int[] dx = { -1, 1, 0, 0 }; + private static final int[] dy = { 0, 0, -1, 1 }; + + 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 StringBuilder sb = new StringBuilder(); + private static StringTokenizer st; + + private static int H, W; + private static int[][] prisoners; + private static int[][][] dist; + private static char[][] matrix; + private static Deque dq; + + private static class Node { + int x; + int y; + int cnt; + + Node(int x, int y, int cnt) { + this.x = x; + this.y = y; + this.cnt = cnt; + } + + } + + public static void main(String[] args) throws IOException { + int T = Integer.parseInt(br.readLine()); + + while (T-- > 0) { + init(); + sol(); + } + + bw.write(sb.toString()); + bw.flush(); + bw.close(); + br.close(); + } + + private static void init() throws IOException { + st = new StringTokenizer(br.readLine()); + H = Integer.parseInt(st.nextToken()); + W = Integer.parseInt(st.nextToken()); + + prisoners = new int[2][2]; + int idx = 0; + + matrix = new char[H + 2][W + 2]; + dist = new int[3][H + 2][W + 2]; + + for (int i = 0; i < H + 2; i++) { + Arrays.fill(dist[0][i], INF); + Arrays.fill(dist[1][i], INF); + Arrays.fill(dist[2][i], INF); + Arrays.fill(matrix[i], '.'); + } + + for (int i = 1; i <= H; i++) { + String line = br.readLine(); + for (int j = 1; j <= W; j++) { + matrix[i][j] = line.charAt(j - 1); + + if (matrix[i][j] == '$') { + prisoners[idx][0] = i; + prisoners[idx++][1] = j; + matrix[i][j] = '.'; + } + } + } + + dq = new ArrayDeque<>(); + } + + private static void sol() { + bfs(0, 0, 0); + bfs(1, prisoners[0][0], prisoners[0][1]); + bfs(2, prisoners[1][0], prisoners[1][1]); + + int ans = INF; + for (int i = 0; i < H + 2; i++) { + for (int j = 0; j < W + 2; j++) { + if (matrix[i][j] == '*') continue; + + int sum = dist[0][i][j] + dist[1][i][j] + dist[2][i][j]; + if (matrix[i][j] == '#') sum -= 2; + + ans = Math.min(ans, sum); + } + } + + sb.append(ans).append('\n'); + } + + private static void bfs(int id, int x, int y) { + dq.clear(); + dq.offer(new Node(x, y, 0)); + dist[id][x][y] = 0; + + while (!dq.isEmpty()) { + Node cur = dq.poll(); + + if (dist[id][cur.x][cur.y] < cur.cnt) continue; + + for (int d = 0; d < 4; d++) { + int nx = cur.x + dx[d]; + int ny = cur.y + dy[d]; + + if (OOB(nx, ny) || matrix[nx][ny] == '*') continue; + + int newDist = matrix[nx][ny] == '#' ? cur.cnt + 1 : cur.cnt; + + if (newDist < dist[id][nx][ny]) { + dist[id][nx][ny] = newDist; + + if (newDist == cur.cnt) { + dq.offerFirst(new Node(nx, ny, newDist)); + } else { + dq.offerLast(new Node(nx, ny, newDist)); + } + } + } + } + } + + private static boolean OOB(int x, int y) { + return x < 0 || H + 2 <= x || y < 0 || W + 2 <= y; + } + +} +```