Merge pull request #503 from AlgorithmWithGod/03do-new30

[20250719] BOJ / G5 / 아우으 우아으이야!! / 신동윤

Author: ShinHeeEul

03do-new30/202507/19 BOJ G5 아우으 우아으이야.md

@@ -0,0 +1,43 @@
+```java
+import java.util.*;
+import java.io.*;
+
+public class Main {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        int N = Integer.parseInt(br.readLine());
+        StringTokenizer st;
+
+        int sum = 0;
+        boolean first = true;
+        int left = 0;
+        int right = 0;
+
+        for (int i = 0; i < N; i++) {
+            st = new StringTokenizer(br.readLine());
+            int x = Integer.parseInt(st.nextToken());
+            int y = Integer.parseInt(st.nextToken());
+            if (first) {
+                left = x;
+                right = y;
+                sum += y - x;
+                first = false;
+                continue;
+            }
+
+            if (right <= x) {
+                sum += y - x;
+                left = x;
+                right = y;
+            } else {
+                if (y < right) continue;
+                int tmp = y - right;
+                sum += tmp;
+                right = y;
+            }
+        }
+        System.out.println(sum);
+        br.close();
+    }
+}
+```