[20250209] BOJ / 골드4 / 창영이와 퇴근 / 설진영

Seol-JY/202502/09 BOJ G4 창영이와 퇴근.md

@@ -0,0 +1,62 @@
+```java
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.*;
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        int N = Integer.parseInt(br.readLine());
+        int[][] grid = new int[N][N];
+
+        // 입력
+        for(int i = 0; i < N; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            for(int j = 0; j < N; j++) {
+                grid[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+
+        // 다익스트라를 위한 초기화
+        PriorityQueue<int[]> pq = new PriorityQueue<>((a,b) -> a[2] - b[2]); // [x, y, maxDiff]
+        boolean[][] visited = new boolean[N][N];
+        int[][] dist = new int[N][N];
+        for(int i = 0; i < N; i++) {
+            Arrays.fill(dist[i], Integer.MAX_VALUE);
+        }
+
+        int[] dx = {-1, 1, 0, 0};
+        int[] dy = {0, 0, -1, 1};
+
+        dist[0][0] = 0;
+        pq.offer(new int[]{0, 0, 0});
+
+        while(!pq.isEmpty()) {
+            int[] current = pq.poll();
+            int x = current[0];
+            int y = current[1];
+
+            if(visited[x][y]) continue;
+            visited[x][y] = true;
+
+            for(int i = 0; i < 4; i++) {
+                int nx = x + dx[i];
+                int ny = y + dy[i];
+
+                if(nx < 0 || nx >= N || ny < 0 || ny >= N || visited[nx][ny]) continue;
+
+                int diff = Math.abs(grid[nx][ny] - grid[x][y]);
+                int maxDiff = Math.max(dist[x][y], diff);
+
+                if(dist[nx][ny] > maxDiff) {
+                    dist[nx][ny] = maxDiff;
+                    pq.offer(new int[]{nx, ny, maxDiff});
+                }
+            }
+        }
+
+        System.out.println(dist[N-1][N-1]);
+    }
+}
+```