Create remove-duplicates-sorted.java

Not an optimal solution, sets solve it much better by just not allowing duplicates.
Use LinkedHashSet next time.

remove-duplicates-sorted.java

@@ -0,0 +1,17 @@
+class Solution {
+    public int removeDuplicates(int[] nums) {
+        Set<Integer> map = new HashSet<Integer>();
+        int shift = 0;
+        for (int i = 0; i < nums.length; i++) {
+            if (map.contains(nums[i + shift])) {
+                for (int j = (i + shift); j < nums.length - 1; j++) {
+                    nums[j] = nums[j+1];
+                }
+                shift--;
+            } else {
+                map.add(nums[i + shift]);
+            }
+        } 
+        return nums.length + shift;
+    }
+}