Codeforces Round #661 (Div. 3) Solutions

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Question A- https://youtu.be/tSboQu6Vu_k
Question B- https://youtu.be/NxfA91zSNlI
Question C- https://youtu.be/txEX3EwWaSw
Question D- https://youtu.be/BRrPfZQ3ScU

Tip for question C lies in Constraints , it can be done very easily

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