At the beginning of your program, it can input A or B or C to select different function  

A: input a sorted bucket index, and ouput the corresponding old index

B: input a old index, and ouput the corresponding new bucket index

C: input a new index, and output how many original buckets are contained in 
new bucket and all the old indices stored in that new bucket

D: Please draw the curve on your report by using Excel

( The input file is identical to hw4 )