Merge pull request #1318 from AlgorithmWithGod/JHLEE325

[20251105] BOJ / G5 / 아우으 우아으이야!! / 이준희

Author: ShinHeeEul

JHLEE325/202511/05 BOJ G5 아우으 우아으이야!!.md

@@ -0,0 +1,53 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    static class line implements Comparable<line> {
+        int x, y;
+        line(int x, int y) { this.x = x; this.y = y; }
+        @Override
+        public int compareTo(line o) {
+            if (this.x != o.x) return Integer.compare(this.x, o.x);
+            return Integer.compare(this.y, o.y);
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+        int N = Integer.parseInt(br.readLine());
+
+        line[] arr = new line[N];
+        for (int i = 0; i < N; i++) {
+            StringTokenizer st = new StringTokenizer(br.readLine());
+            int a = Integer.parseInt(st.nextToken());
+            int b = Integer.parseInt(st.nextToken());
+            arr[i] = new line(a, b);
+        }
+        Arrays.sort(arr);
+
+        long res = 0;
+        int x = arr[0].x;
+        int y = arr[0].y;
+
+        for (int i = 1; i < N; i++) {
+            int ns = arr[i].x;
+            int ne = arr[i].y;
+            if (ns <= y) {
+                if (ne > y) {
+                    y = ne;
+                }
+            } else {
+                res += (long)(y - x);
+                x = ns;
+                y = ne;
+            }
+        }
+        res += (long)(y - x);
+
+        System.out.println(res);
+    }
+}
+```