waiting For Codemelange (rated) contest Editorial… plz admin sir look at matter and upload as early as possible… Waiting for editorials to understand some problem solution
But they have provided the short editorial here …https://discuss.codechef.com/questions/124364/invitation-to-alkhwarizm-2018-rated . Also a thread is out there on Codeforces where there is a good discussion on these problems:)