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1834A - Unit Array was authored and prepared by Artyom123

1834B - Maximum Strength was authored by jury of the olympiad, and prepared by TheEvilBird

1834C - Game with Reversing was authored and prepared by sevlll777

1834D - Survey in Class was authored by vaaven and Mikhango and prepared by Alexdat2000

1834E - MEX of LCM was authored by TeaTime and prepared by teraqqq

1834F - Typewriter was authored and prepared by Ziware