Add test functionality#5

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Igorjan94 wants to merge 13 commits intocoderick14:masterfrom

Igorjan94:add-test

Commits on Sep 19, 2017

Commits on Oct 25, 2017

gym for codeforces support
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Commits on Apr 27, 2019

c++17
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Commits on Sep 3, 2019

kotlin
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Commits on Sep 21, 2019