diff --git "a/JHLEE325/202511/26 BOJ G5 \352\260\225\354\235\230\354\213\244.md" "b/JHLEE325/202511/27 BOJ G5 \352\260\225\354\235\230\354\213\244.md"
similarity index 100%
rename from "JHLEE325/202511/26 BOJ G5 \352\260\225\354\235\230\354\213\244.md"
rename to "JHLEE325/202511/27 BOJ G5 \352\260\225\354\235\230\354\213\244.md"
diff --git "a/JHLEE325/202511/27 BOJ G5 \354\204\240\353\260\234 \353\252\205\353\213\250.md" "b/JHLEE325/202511/28 BOJ G5 \354\204\240\353\260\234 \353\252\205\353\213\250.md"
similarity index 100%
rename from "JHLEE325/202511/27 BOJ G5 \354\204\240\353\260\234 \353\252\205\353\213\250.md"
rename to "JHLEE325/202511/28 BOJ G5 \354\204\240\353\260\234 \353\252\205\353\213\250.md"
diff --git "a/JHLEE325/202511/30 BOJ G4 \354\235\264\354\244\221 \354\232\260\354\204\240\354\210\234\354\234\204 \355\201\220.md" "b/JHLEE325/202511/30 BOJ G4 \354\235\264\354\244\221 \354\232\260\354\204\240\354\210\234\354\234\204 \355\201\220.md"
new file mode 100644
index 00000000..41d100c5
--- /dev/null
+++ "b/JHLEE325/202511/30 BOJ G4 \354\235\264\354\244\221 \354\232\260\354\204\240\354\210\234\354\234\204 \355\201\220.md"	
@@ -0,0 +1,56 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+        int T = Integer.parseInt(br.readLine());
+
+        for (int t = 0; t < T; t++) {
+            int K = Integer.parseInt(br.readLine());
+            TreeMap<Integer, Integer> map = new TreeMap<>();
+
+            for (int i = 0; i < K; i++) {
+                st = new StringTokenizer(br.readLine());
+                char op = st.nextToken().charAt(0);
+                int num = Integer.parseInt(st.nextToken());
+
+                if (op == 'I') {
+                    map.put(num, map.getOrDefault(num, 0) + 1);
+                }
+                else {
+                    if (map.isEmpty()) {
+                        continue;
+                    }
+
+                    int key;
+
+                    if (num == 1) {
+                        key = map.lastKey();
+                    }
+                    else {
+                        key = map.firstKey();
+                    }
+
+                    int cnt = map.get(key);
+                    if (cnt == 1) {
+                        map.remove(key);
+                    } else {
+                        map.put(key, cnt - 1);
+                    }
+                }
+            }
+
+            if (map.isEmpty()) {
+                System.out.println("EMPTY");
+            } else {
+                int max = map.lastKey();
+                int min = map.firstKey();
+                System.out.println(max + " " + min);
+            }
+        }
+    }
+}
+```