Level of Qustion:
Finish:
* easily
** trouble(麻烦)
***hard(Need check book or other information)
Not:
+ easy understand&after look can code by myself
++ hard understand&after look can code by myself
+++ hard understand&hard to recode by myself
Level of Qustion:Record the difficult level of Problem For future review
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Origin www.cnblogs.com/Marigolci/p/11308216.html
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