Several data structures && algorithms surface question "Four" (update ing)

This is my third side of the question summary.

To see the previous content, please visit:

http://zhweizhi.blog.51cto.com/10800691/1763237

(Some data structure && algorithm surface question "One" (update completed))

http://zhweizhi.blog.51cto.com/10800691/1775780

(Some data structure && algorithm surface question "Two" (update completed))

http://zhweizhi.blog.51cto.com/10800691/1787562

(Some data structure && algorithm surface question "three" (update completed))

In addition, all of my brush problem codes are here:

Https://github.com/HonestFox/BrushQuestion

Several data structures && algorithms surface question "Four" (update ing)