add: 26 removeDuplicates in swift

Author: prash5t

programming-swift/26.swift

@@ -0,0 +1,30 @@
+/// take list of numbers and return length of non duplicate numbers
+// The judge will test your solution with the following code:
+
+// int[] nums = [...]; // Input array
+// int[] expectedNums = [...]; // The expected answer with correct length
+
+// int k = removeDuplicates(nums); // Calls your implementation
+
+// assert k == expectedNums.length;
+// for (int i = 0; i < k; i++) {
+//     assert nums[i] == expectedNums[i];
+// }
+
+func removeDuplicated(nums: inout [Int])-> Int{
+        var uniqueUptoIndex: Int = 0;
+        for index: Int in 1..<nums.count{
+            if(nums[uniqueUptoIndex] != nums[index]){
+                uniqueUptoIndex += 1;
+                nums[uniqueUptoIndex] = nums[index];
+            }
+        }
+        return uniqueUptoIndex+1
+}
+
+
+// to test
+var sample1 = [0,0,1,2,3]
+var sample2: [Int] = [1,2,3];
+print(removeDuplicated(nums: &sample1)) // should be 4
+print(removeDuplicated(nums: &sample2)) // should be 3