Update doubly linked list#3619

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realDuYuanChao merged 4 commits intoTheAlgorithms:masterfrom

realDuYuanChao:doublylinkedlist

Oct 21, 2020

Commits on Oct 21, 2020

update doubly linked list
realDuYuanChao
committed
reformat code
realDuYuanChao
committed
add test to iter
realDuYuanChao
committed
updating DIRECTORY.md

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