[20260212] BOJ / G5 / 경쟁적 전염 / 이준희

JHLEE325/202602/12 BOJ G5 경쟁적 전염.md

@@ -0,0 +1,78 @@
+```java
+import java.io.*;
+import java.util.*;
+
+class Virus implements Comparable<Virus> {
+    int id, time, r, c;
+
+    public Virus(int id, int time, int r, int c) {
+        this.id = id;
+        this.time = time;
+        this.r = r;
+        this.c = c;
+    }
+
+    // 바이러스 번호 기준 오름차순 정렬
+    @Override
+    public int compareTo(Virus o) {
+        return this.id - o.id;
+    }
+}
+
+public class Main {
+    static int N, K, S, targetX, targetY;
+    static int[][] map;
+    static int[] dr = {-1, 1, 0, 0};
+    static int[] dc = {0, 0, -1, 1};
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine());
+
+        N = Integer.parseInt(st.nextToken());
+        K = Integer.parseInt(st.nextToken());
+        map = new int[N][N];
+
+        List<Virus> virusList = new ArrayList<>();
+
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            for (int j = 0; j < N; j++) {
+                map[i][j] = Integer.parseInt(st.nextToken());
+                if (map[i][j] != 0) {
+                    virusList.add(new Virus(map[i][j], 0, i, j));
+                }
+            }
+        }
+
+        Collections.sort(virusList);
+
+        Deque<Virus> q = new ArrayDeque<>(virusList);
+
+        st = new StringTokenizer(br.readLine());
+        S = Integer.parseInt(st.nextToken());
+        targetX = Integer.parseInt(st.nextToken());
+        targetY = Integer.parseInt(st.nextToken());
+
+        while (!q.isEmpty()) {
+            Virus curr = q.poll();
+
+            if (curr.time == S) break;
+
+            for (int i = 0; i < 4; i++) {
+                int nr = curr.r + dr[i];
+                int nc = curr.c + dc[i];
+
+                if (nr >= 0 && nr < N && nc >= 0 && nc < N) {
+                    if (map[nr][nc] == 0) {
+                        map[nr][nc] = curr.id;
+                        q.add(new Virus(curr.id, curr.time + 1, nr, nc));
+                    }
+                }
+            }
+        }
+
+        System.out.println(map[targetX - 1][targetY - 1]);
+    }
+}
+```