更新历史 - 差分约束

format: 将公式中的`...`替换为`\dots` (#4524)

fix: sample code reference

feat: add code block tabs

feat(ds, graph): add semantic label for paragraph (#4342)

fix(graph): separated code from markdown file and add notes (#3561)

feat(graph, geometry): add Python example (#3572)

apply bot

Update diff-constraints.md

fold the code

style: format markdown files with remark-lint

fix format

delete DFS-SPFA code

/problemnew/show -> /problem

www.luogu.org -> www.luogu.com.cn

:bug: fix lots of links

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