From deffcd9f7a70800ecaf235fe4c040971dba888ab Mon Sep 17 00:00:00 2001
From: piyushlasane <160647609+piyushlasane@users.noreply.github.com>
Date: Wed, 1 Oct 2025 21:09:35 +0530
Subject: [PATCH] Add Solution 2: concise Java implementation for 504. Base 7

---
 solution/0500-0599/0504.Base 7/README_EN.md | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/solution/0500-0599/0504.Base 7/README_EN.md b/solution/0500-0599/0504.Base 7/README_EN.md
index 20c58cdef8dff..acd1583602420 100644
--- a/solution/0500-0599/0504.Base 7/README_EN.md	
+++ b/solution/0500-0599/0504.Base 7/README_EN.md	
@@ -166,6 +166,25 @@ impl Solution {
 
 <!-- tabs:end -->
 
+### Solution 2: Concise Implementation (Integer.toString)
+
+We can directly use Java’s built-in base conversion method.  
+Time complexity: $O(\log_7 n)$, space complexity: $O(1)$.
+
+<!-- tabs:start -->
+
+#### Java
+
+```java
+class Solution {
+    public String convertToBase7(int num) {
+        return Integer.toString(num, 7);
+    }
+}
+```
+
+<!-- tabs:end -->
+
 <!-- solution:end -->
 
 <!-- problem:end -->