Create BJ_9205_맥주마시면서이동하기.java

Author: kn9012

250505/BJ_9205_맥주마시면서이동하기.java

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+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.ArrayDeque;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Queue;
+import java.util.StringTokenizer;
+
+/**
+ * 백준 9205번 맥주 마시면서 걸어가기 
+ * - BFS
+ */
+
+public class Main {
+	public static void main(String[] args) throws IOException {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		StringTokenizer st;
+		
+		int t = Integer.parseInt(br.readLine());
+		
+		for (int T = 0; T < t; T++) {
+			int n = Integer.parseInt(br.readLine());
+			
+			int[] home = new int[2];
+			st = new StringTokenizer(br.readLine());
+			home[0] = Integer.parseInt(st.nextToken());
+			home[1] = Integer.parseInt(st.nextToken());
+			
+			List<int[]> list = new ArrayList<>();
+			for (int i = 0; i < n; i++) {
+				st = new StringTokenizer(br.readLine());
+				
+				int x = Integer.parseInt(st.nextToken());
+				int y = Integer.parseInt(st.nextToken());
+				
+				list.add(new int[] { x, y });
+			}
+			
+			int[] festival = new int[2];
+			st = new StringTokenizer(br.readLine());
+			festival[0] = Integer.parseInt(st.nextToken());
+			festival[1] = Integer.parseInt(st.nextToken());
+			
+			boolean isPossible = false;
+			boolean[] visited = new boolean[list.size()];
+			
+			Queue<int[]> queue = new ArrayDeque<>();
+			queue.offer(home);
+			
+			while (!queue.isEmpty()) {
+				int[] cur = queue.poll();
+				
+				int dist = Math.abs(cur[0] - festival[0]) + Math.abs(cur[1] - festival[1]);
+				if (dist <= 1000) {
+					isPossible = true;
+					break;
+				}
+				
+				for (int i = 0; i < list.size(); i++) {
+					int[] next = list.get(i);
+					
+					dist = Math.abs(cur[0] - next[0]) + Math.abs(cur[1] - next[1]);
+					if (dist <= 1000 && !visited[i]) {
+						queue.offer(next);
+						visited[i] = true;
+					}
+				}
+			}
+			
+			System.out.println(isPossible ? "happy" : "sad");
+		}
+	}
+}