Finished first exercise#1

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lkrizan wants to merge 4 commits intoavl-cpp-training:masterfrom

lkrizan:master

Commits on Nov 15, 2018

Finished first exercise
Luka Križan
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Performance improvement for frequency list insert
Luka Križan
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Finished 2nd exercise
Luka Križan
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Commits on Nov 19, 2018

Fixed findings from comments in pull request
lkrizan
committed