need help in top-k word frequent algorithm

i need to do a program that is called Top-k, which that can read many files in a same directory, and after reading these file, and it should print the most k frequent word at last.....also it need me to write a precomputed program to increase the speed also before running that top-k file.

i want to know what the precomputed program is for what, why need it?
and also my idea is using a link-list to create the word and the frequent in top-k program, am my think is correct?

i hope someone can give me some idea and hits for finishing it.
really thank you.
oh my God ,,and all that with C++
what do u mean? is it very difficult to do that??
anyone can help me about this, please~
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