Better try quick select Looking for interview coaching? We have helped 1000+ people land a job at Google, Facebook and other top companies. Visit aonecode .com or ONE-ON-ONE private lessons by FB and Google engineers! SYSTEM DESIGN ALGORITHMS (conquer DP, Greedy, Graph, Advanced Algorithms, Clean Coding), latest interview questions from FAANG, mock interviews. Get hired from Google, FB, Amazon, LinkedIn and other top-tier companies after weeks of training.

That's pretty straightforward, should be able to achieve this in o(n) time