https://1.bp.blogspot.com/-LbQ7ScjQ9Rk/Xu204s4qNFI/AAAAAAAAOUI/uq-XuTEOu44ajSrvq-o0mfRNvA1rxHhtgCK4BGAsYHg/w625-h351/hackerrank-virtual-functions-in-C-plus-plus-problem-solution.png