Recca Chao 的 gitHub page

推廣網站開發,包含 Laravel 和 Kotlin 後端撰寫、自動化測試、讀書心得等。Taiwan Kotlin User Group 管理員。

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Hi, here's your problem today. This problem was recently asked by Google:

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.