From 4e1d2b011a160e7935ccfa4040c0f2de3e834031 Mon Sep 17 00:00:00 2001
From: SuKyoung <sukyoung.dev@gmail.com>
Date: Wed, 16 Apr 2025 07:19:54 +0900
Subject: [PATCH 1/2] add: #220 Valid Palindrome

---
 valid-palindrome/sukyoungshin.ts | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 valid-palindrome/sukyoungshin.ts

diff --git a/valid-palindrome/sukyoungshin.ts b/valid-palindrome/sukyoungshin.ts
new file mode 100644
index 000000000..e2fdcfac4
--- /dev/null
+++ b/valid-palindrome/sukyoungshin.ts
@@ -0,0 +1,24 @@
+const alphaNumSet = new Set([..."abcdefghijklmnopqrstuvwxyz0123456789"]);
+
+function isPalindrome(s: string): boolean {
+  let normalized = "";
+
+  for (const characters of s) {
+    const lower = characters.toLowerCase();
+    if (alphaNumSet.has(lower)) {
+      normalized += lower;
+    }
+  }
+
+  let left = 0;
+  let right = normalized.length - 1;
+  while (left < right) {
+    if (normalized[left] !== normalized[right]) {
+      return false;
+    }
+    left++;
+    right--;
+  }
+
+  return true;
+}

From feca8be404f0e01bd92a3625b7c1c9ee593890c8 Mon Sep 17 00:00:00 2001
From: SuKyoung <sukyoung.dev@gmail.com>
Date: Wed, 16 Apr 2025 13:55:51 +0900
Subject: [PATCH 2/2] add: #232 Number of 1 Bits

---
 number-of-1-bits/sukyoungshin.ts | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 number-of-1-bits/sukyoungshin.ts

diff --git a/number-of-1-bits/sukyoungshin.ts b/number-of-1-bits/sukyoungshin.ts
new file mode 100644
index 000000000..44bc4d14a
--- /dev/null
+++ b/number-of-1-bits/sukyoungshin.ts
@@ -0,0 +1,13 @@
+function hammingWeight(n: number): number {
+  let count = 0;
+  let num = n;
+
+  while (num > 0) {
+    if (num % 2 === 1) {
+      count++;
+    }
+    num = Math.floor(num / 2);
+  }
+
+  return count;
+};