[20251027] BOJ / P5 / 버스 노선 / 한종욱

Ukj0ng/202510/27 BOJ P5 버스 노선.md

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+```
+import java.io.*;
+import java.util.*;
+
+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 List<int[]> busLines;
+    private static boolean[] contains;
+    private static int N, M;
+    public static void main(String[] args) throws IOException {
+        init();
+        sweep();
+
+        for (int i = 1; i <= M; i++) {
+            if (!contains[i]) bw.write(i + " ");
+        }
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+        M = Integer.parseInt(br.readLine());
+
+        busLines = new ArrayList<>();
+        contains = new boolean[M+1];
+
+        for (int i = 1; i <= M; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            int a = Integer.parseInt(st.nextToken());
+            int b = Integer.parseInt(st.nextToken());
+
+            if (a < b) {
+                busLines.add(new int[]{a, b, i});
+                busLines.add(new int[]{a+N, b+N, i});
+            } else {
+                busLines.add(new int[]{a, b+N, i});
+            }
+        }
+
+        busLines.sort((o1, o2) -> {
+            if (o1[0] == o2[0]) return Integer.compare(o2[1], o1[1]);
+            return Integer.compare(o1[0], o2[0]);
+        });
+    }
+
+    private static void sweep() {
+        int end = -1;
+
+        for (int[] busLine : busLines) {
+            if (busLine[1] <= end) {
+                contains[busLine[2]] = true;
+            } else {
+                end = busLine[1];
+            }
+        }
+    }
+}
+```