diff --git "a/JHLEE325/202510/01 BOJ G4 \354\240\204\355\231\224\353\262\210\355\230\270 \353\252\251\353\241\235.md" "b/JHLEE325/202510/01 BOJ G4 \354\240\204\355\231\224\353\262\210\355\230\270 \353\252\251\353\241\235.md"
new file mode 100644
index 00000000..8a5f30b9
--- /dev/null
+++ "b/JHLEE325/202510/01 BOJ G4 \354\240\204\355\231\224\353\262\210\355\230\270 \353\252\251\353\241\235.md"	
@@ -0,0 +1,40 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class Main {
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st;
+        StringBuilder sb = new StringBuilder();
+
+        int T = Integer.parseInt(br.readLine());
+
+        for (int t = 0; t < T; t++) {
+            int n = Integer.parseInt(br.readLine());
+
+            String[] phone = new String[n];
+
+            for (int i = 0; i < n; i++) {
+                phone[i] = br.readLine();
+            }
+
+            Arrays.sort(phone);
+
+            boolean available = true;
+            for (int i = 0; i < n - 1; i++) {
+                if (phone[i + 1].startsWith(phone[i])) {
+                    available = false;
+                    break;
+                }
+            }
+
+            sb.append(available ? "YES\n" : "NO\n");
+        }
+
+        System.out.print(sb.toString());
+    }
+
+}
+```