New card game

Pranjal was getting bored in the quarantine so he bought playing cards from amazon but he received some different playing card from amazon. The deck had N cards and the i – th card from top had integer Ai written on it. So, Pranjal made a game of his own. First, Player A will take some number of cards from the top of the deck, then player B will take all the remaining cards. Here, both player A an