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Codeforces Profile :- https://codeforces.com/profile/_Mahmo... Ask Mahmoud Ayman: https://ask-mahmoud.vercel.app/ Facebook Group :- https://www.facebook.com/share/rhjLDx... What'sApp Group 1:- https://chat.whatsapp.com/EMyPmpN7DD8... What'sApp Group 2:- https://chat.whatsapp.com/GwQVbZPusBD... What'sApp Group 3:- https://chat.whatsapp.com/EJv3e6g34ju... Problems : https://atcoder.jp/contests/dp/tasks/... https://cses.fi/problemset/task/1690 Follow Me On : Codeforces https://codeforces.com/profile/_Mahmo... linked in   / mahmoud-ayman-a78346225   Github https://github.com/Mahmoud-ayman1 Tik tok https://vm.tiktok.com/ZM8XkNhbq/ Facebook https://www.facebook.com/mahmoudayman... Instagram https://instagram.com/mahmoud_ayman_7... Twitter   / mahmoud81266826   Youtube    / @mahmoudayman8873   Ask https://ask-mahmoud.vercel.app/