[Week3](gmlwls96) reverse-bits

Author: gmlwls96

reverse-bits/gmlwls96.kt

@@ -0,0 +1,14 @@
+class Solution {
+    // you need treat n as an unsigned value
+    fun reverseBits(n: Int): Int {
+        var bitString = Integer.toBinaryString(n)
+        bitString = CharArray(32 - bitString.length) { '0' }.concatToString() + bitString
+        var result = 0
+        var scale = 1
+        bitString.forEach {
+            result += it.digitToInt() * scale
+            scale *= 2
+        }
+        return result
+    }
+}