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Merge pull request #2852 from Alpacabla/patch-1

Update dsu-on-tree.md

添加基环树和基环森林的英文名

https://en.wikipedia.org/wiki/Pseudoforest

Update dsu-on-tree.md

图中不是标红是标粗...

优化取模运算的次数

change \mathbb to \mathbf

由于近百年来数学符号演变，定义集合符号应使用 **人民教育出版社普通高中数学教材 A 版** 书写的版本，即 实数集 `$\mathbf{R}$`，正整数集 `$\mathbf{N}^*$` 等。同理，其他的符号应按照中国国内最常使用的版本来书写，重点参照数学和信息技术课本。

fix a typo in simplex.nd

Merge pull request #2847 from melxy1997/patch-1

单词小错误

Merge pull request #2848 from mao1t/patch-1

Update hld.md

Update hld.md

单词小错误

分治（英语：Divide and Conquer）之前缺了个单词

Merge pull request #2845 from sbofgayschool/dev-sbofgayschool

Added median maintenance as an application of heap.

modify guide for Code Runner.

Revert "Add vscode-7.png"

This reverts commit 0a6e54e1e0929c8c1504272890aafee1539033bf.

To change the picture.

Merge pull request #2843 from OI-wiki/nearest-points-fix

Fixed typos as suggested.

fix(nearest-points): add a space

feat(random): add pseudo random number generator

fix(vscode): fix typo

Added median maintenance as an application of heap.

Update bigraph-match.md

注释有点问题，怕误导别人

fix(nearest-points): unhide a link

Due to Code Jam update, this link was inaccessible before.

docs: (max-flow) 增加 EK 算法的注释

Merge pull request #2840 from xyf007/patch-1

Fix the wrong titles.

Add guide for Code Runner extension.

Add vscode-7.png

Fix the wrong titles.

删去了标题中的公式和“或运算”后面多出来的 $A_i$。

Merge pull request #2839 from ranwen/master

fix math/mobius.md: 修正函数性质及添加加性函数表述

fix math/mobius.md: 修正函数性质及添加加性函数表述

Merge pull request #1 from OI-wiki/master

upd1

Update docs/topic/bracket.md

Co-authored-by: ksyx <18738953+ksyx@users.noreply.github.com>