feat: Add solution for LeetCode problem 190

Author: WhiteHyun

reverse-bits/WhiteHyun.swift

@@ -0,0 +1,28 @@
+//  
+//  190. Reverse Bits
+//  https://leetcode.com/problems/reverse-bits/description/
+//  Dale-Study
+//  
+//  Created by WhiteHyun on 2024/05/19.
+//  
+
+final class Solution {
+
+  // MARK: - Runtime: 5ms / Memory 16.12 MB
+
+  func reverseBits(_ n: Int) -> Int {
+    let reversedStringBits = String(String(n, radix: 2).reversed())
+    return Int(reversedStringBits + String(repeating: "0", count: 32 - reversedStringBits.count), radix: 2)!
+  }
+
+  // MARK: - Runtime: 5ms / Memory 15.72 MB
+
+  func reverseBits2(_ n: Int) -> Int {
+    var answer = 0
+
+    for index in 0 ..< 32 {
+      answer += ((n >> (32 - index - 1)) & 1) << index
+    }
+    return answer
+  }
+}