[20251020] BOJ / G5 / 선 긋기 / 한종욱

Author: Ukj0ng

Ukj0ng/202510/20 BOJ G5 선 긋기.md

@@ -0,0 +1,55 @@
+```
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    private static BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+    private static int[][] lines;
+    private static int N;
+    public static void main(String[] args) throws IOException {
+        init();
+        int answer = sweep();
+
+        bw.write(answer + "\n");
+        bw.flush();
+        bw.close();
+        br.close();
+    }
+
+    private static void init() throws IOException {
+        N = Integer.parseInt(br.readLine());
+
+        lines = new int[N][2];
+
+        for (int i = 0; i < N; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            lines[i][0] = Integer.parseInt(st.nextToken());
+            lines[i][1] = Integer.parseInt(st.nextToken());
+        }
+
+        Arrays.sort(lines, (o1, o2) -> {
+            if (o1[0] == o2[0]) return Integer.compare(o1[1], o2[1]);
+            return Integer.compare(o1[0], o2[0]);
+        });
+    }
+
+    private static int sweep() {
+        int result = 0;
+        int prevS = -1000000001;
+        int prevE = -1000000001;
+
+        for (int[] line : lines) {
+            if (prevE < line[0]) {
+                result += (prevE - prevS);
+                prevS = line[0];
+            }
+
+            prevE = Math.max(prevE, line[1]);
+        }
+
+        result += (prevE - prevS);
+        return result;
+    }
+}
+```