solutions of wanghuan #5

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njustwh2014 wants to merge 9 commits intoSEU-CodingTogether:masterfrom

njustwh2014:master

Commits on Nov 2, 2018

modify
wanghuan
committed
modify again
wanghuan
committed
add delay time to simulate write time-consuming
wanghuan
committed

Commits on Nov 26, 2018

Commits on Nov 27, 2018