From ca075ef2d52e4d8a587ce3a09f7f58b863111473 Mon Sep 17 00:00:00 2001
From: JeonJe <43032391+JeonJe@users.noreply.github.com>
Date: Mon, 6 Jul 2026 21:23:00 +0900
Subject: [PATCH 1/2] valid palindrome solution

---
 valid-palindrome/JeonJe.java | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 valid-palindrome/JeonJe.java

diff --git a/valid-palindrome/JeonJe.java b/valid-palindrome/JeonJe.java
new file mode 100644
index 0000000000..7892c22f6d
--- /dev/null
+++ b/valid-palindrome/JeonJe.java
@@ -0,0 +1,23 @@
+import java.util.*;
+
+// TC: O(n)
+// SC: O(n)
+class Solution {
+    public boolean isPalindrome(String s) {
+        StringBuilder sb = new StringBuilder();
+
+        for (char c : s.toCharArray()) {
+            if (Character.isLetterOrDigit(c)) {
+                sb.append(Character.toLowerCase(c));
+            }
+        }
+
+        for (int i = 0; i < sb.length() / 2; i++) {
+            if (sb.charAt(i) != sb.charAt(sb.length() - 1 - i)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+}

From f2a63f66383755512dbc96dc330106ba39a3a849 Mon Sep 17 00:00:00 2001
From: JeonJe <43032391+JeonJe@users.noreply.github.com>
Date: Tue, 7 Jul 2026 22:19:03 +0900
Subject: [PATCH 2/2] number of 1 bits solution

---
 number-of-1-bits/JeonJe.java | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 number-of-1-bits/JeonJe.java

diff --git a/number-of-1-bits/JeonJe.java b/number-of-1-bits/JeonJe.java
new file mode 100644
index 0000000000..6199171708
--- /dev/null
+++ b/number-of-1-bits/JeonJe.java
@@ -0,0 +1,17 @@
+import java.util.*;
+
+// TC: O(1)
+// SC: O(1)
+class Solution {
+    public int hammingWeight(int n) {
+        int answer = 0;
+
+        while (n != 0) {
+            if ((n & 1) == 1) {
+                answer++;
+            }
+            n = n >>> 1;
+        }
+        return answer;
+    }
+}