its a hackerrank question. my friend send me to solved this but i couldn't able to solve this question plz someone help me to solved this question.****

i have attached image to google drive plz help. Text link is below

[ link here...](https://drive.google.com/drive/folders/1MrodjSG1NgB_LqxWxIZcSL9yRyd7SMSo?dmr=1&ec=wgc-drive-hero-goto)