#packages Easy/Mid/Hard
#Format FileName(QuestionName)_NoOfQuestion
eg.BuildArray_1920
BuildArray is the file/question's name
1920 is the question's number
#Note
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You can note what you think when you are doing the question
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$ before file name, means this question hasn't done yet.(eg. $xxx_1000)
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Highly recommend you to follow the decreasing rate of pass, to do practice.