27. Remove Element

Author: TBXark

27. Remove Element.md

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+# 27. Remove Element
+
+### 2017-03-26
+
+Given an array and a value, remove all instances of that value in place and return the new length.
+
+Do not allocate extra space for another array, you must do this in place with constant memory.
+
+The order of elements can be changed. It doesn't matter what you leave beyond the new length.
+
+**Example:**
+Given input array *nums* = `[3,2,2,3]`, *val* = `3`
+
+Your function should return length = 2, with the first two elements of *nums* being 2.
+
+
+
+# Solution
+
+```swift
+class Solution {
+    func removeElement(_ nums: inout [Int], _ val: Int) -> Int {
+        var count = nums.count
+        var i = 0
+        while i < count {
+            if nums[i] == val { 
+                nums.remove(at:i)
+                count -= 1
+            } else{
+                i += 1
+            }
+        }
+        return nums.count
+    }
+}
+```
+