Commit 28ee8b9

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+│   Given a list of numbers with only 3 unique numbers (1, 2, 3),
+│sort the
+│   list in O(n) time.
+│   Example 1:
+│Input: [3, 3, 2, 1, 3, 2, 1]
+│Output: [1, 1, 2, 2, 3, 3, 3]
+│
+│def sortNums(nums):
+│  # Fill this in.
+│print sortNums([3, 3, 2, 1, 3, 2, 1])
+│# [1, 1, 2, 2, 3, 3, 3]
+│
+│   Challenge: Try sorting the list using constant space.
+