Du Yuanchao 5e642607c8
Update doubly linked list (#3619)
* update doubly linked list

* reformat code
add more test

* add test to iter

* updating DIRECTORY.md

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
2020-10-21 22:31:09 +08:00
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2020-10-21 12:46:14 +02:00
2020-09-18 22:53:50 +02:00
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