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1、HashMap
HashMap是基于Map接口的实现，存储键值对时，它可以接收null的键值，是无序的，是非同步的，HashMap存储着Entry(hash,key,value,next)对象。
HashMap查询、修改的时间复杂度为O（1）
2、树、二叉树、二叉搜索树
二叉搜索树左孩子的值全部小于根节点，右孩子的值全部大于跟结点，左孩子、右孩子同样满足上述条件。
二叉查找树的中序遍…
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Formulae such as `--("A"="B")` cause `IndexError` in `koala/ast/__init__.py:build_ast` due to "double operator"
Workaround until fix: replace `--` with `1*` in workbook
Example minimum reproductio…
ghost updated
3 years ago
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Write a comprehensive proposal for how controllers should manage sets of pods. The main goal is to make controller APIs more usable and less error-prone.
We've discussed a number of changes:
- uni…
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# C++20 Ranges The Key Advantage - Algorithm Composition - C++ Stories
Conceptually a Range is a simple concept: it’s just a pair of two iterators - to the beginning and to the end of a sequence (or …
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https://github.com/Tufahel/test-practice-jest/blob/1b717b7d42c4d6760eedf4bfef9f595f09b11f66/task1.test.js#L3-L9
Single line of assertion as below would be enough and easier to read:
` expect(stri…
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OS: Ubuntu 20.04
Shapely: 1.8.1.post1
Probably the problem is related to floating point, but I need to find a solution and I'm running out of ideas.
```
from matplotlib import pyplot as plt
fro…
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### LeetCode Username
SamihanDeshmukh
### Problem Number, Title, and Link
https://leetcode.com/problems/palindrome-number/
### Bug Category
Problem constraints
### Bug Description
In traditiona…
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# 参考サイト
[Ruby競プロTips(基本・罠・高速化108 2.7x2.7)](https://zenn.dev/universato/articles/20201210-z-ruby)
# 入力
半角区切りの数値（例："1 2 3 4"）
gets.split.map(&:to_i)
区切りのない数値（例："1234"）
gets.split('').map(&:to_…
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## What
Let's revise `utils.py` of `one-cmds`.
## Why
As `one-cmds` gets matured, the size of `utils.py` is getting bigger. Now, `utils` is too ambiguous to know its purpose. So, I think it'd…
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- `nvim --version`: `NVIM v0.1.5-385-g999590b`
- Operating system/version: OS X / 10.11.5
- Terminal name/version: iTerm2 / Build 3.0.20160607-nightly
- `$TERM`: xterm-256color
- Actual behaviour:
…