Codeforces Round 894 (Div. 3) upsolve A - B - C - D & E

What's App Group : https://chat.whatsapp.com/DcBdeTqLeSu3JJ90g3Xdp4 Prefix sum &Update range : https://youtu.be/pYzNmq_F3GY?si=SulxOwOjvrh93zpu My page at CF : https://codeforces.com/profile/Ahmed_Zeus email : [email protected] linked In : https://www.linkedin.com/in/ahmed-esmat-284a9524a/