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https://leetcode.com/problems/sort-list/
https://leetcode.com/problems/sort-list/discuss/46807/Quick-sort-Merge-sort-Python
https://leetcode.com/problems/sort-list/discuss/46913/Short-and-clean-python-quick-sort-solution
https://blog.csdn.net/u010429424/article/details/77776731
https://blog.csdn.net/runner668/article/details/79785400
https://blog.csdn.net/wumuzi520/article/details/8078322