Rename main.cpp to 1249B1 - Books Exchange (easy version).cpp

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Rename main.cpp to 1249B2 - Books Exchange (hard version).cpp

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Rename main.cpp to 598D - Igor In the Museum.cpp

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Rename main.cpp to 1386B - Array Walk.cpp

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Rename main.cpp to 2019E - Tree Pruning.cpp

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Rename main.cpp to 79A - Bus Game.cpp

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Rename main.cpp to 1277B - Make Them Odd.cpp

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Rename main.cpp to 1384A - Common Prefixes.cpp