check number of Leetcode questions
check number of Leetcode questions

Change-Id: I1333e87cab9445ff1dfe91b3293aa74d41acbb64

BruceZu/KeepTry,BruceZu/sawdust,BruceZu/KeepTry,BruceZu/sawdust,BruceZu/KeepTry,BruceZu/KeepTry,BruceZu/sawdust,BruceZu/sawdust