algorithm

mainly use for self-learning

sorts folder

sorts.py: including bubble_sort, insertion_sort, selection_sort and merge_sort.

Netherlands_flag.py : to solve Netherlands_flag problem

荷兰国旗问题: 给定一个数组arr，和一个数num，请把小于num的数放在数组的左边，等于num的数放在数组的中间，大于num的数放在数组的右边. 要求额外空间复杂度O(1)，时间复杂度O(N)

heap.py: to achive the heap struct.

xiaohe_wenti.py: solve the small sum problem.

小和问题: 在一个数组中，每一个数左边比当前数小的数累加起来，叫做这个数组的小和。求一个数组的小和。小和问题和逆序对问题都是一样的，用归并排序来解。

test.py: some util functions to help test

test_scripts.py: do some test in sorts function.

notes.md:

2addnotes.md: to add notes in the later.

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Name		Name	Last commit message	Last commit date
Latest commit History 149 Commits
__pycache__		__pycache__
notes		notes
problem_solving		problem_solving
sequence_strcuts		sequence_strcuts
sorts		sorts
trees		trees
README.md		README.md
test.py		test.py