Kotlin 704-Binary-Search

kotlin/704-Binary-Search.kt

@@ -0,0 +1,23 @@
+class Solution {
+    // Easy solution
+    /*
+    fun search(nums: IntArray, target: Int): Int {
+        return nums.indexOf(target)
+    }
+    */
+
+    // Recursive solution
+    fun search(nums: IntArray, target: Int): Int {
+        return searchAux(nums, target, 0, nums.size - 1)
+    }
+
+    private fun searchAux(nums: IntArray, target: Int, begin: Int, end: Int): Int {
+        if (begin > end) return -1
+
+        val mid: Int = (begin + end) / 2
+
+        return if (nums[mid] == target) mid
+        else if (nums[mid] > target) searchAux(nums, target, begin, mid - 1)
+        else searchAux(nums, target, mid + 1, end)
+    }
+}