Binary Search

https://www.hackerrank.com/contests/tercer-concurso-de-practica-oie-2020/challenges/potencias

https://jutge.org/problems/P22845_es

https://www.hackerrank.com/contests/bienvenida-oie-2020/challenges/orden

https://www.hackerrank.com/contests/primer-dia-final-oie-2019/challenges/la-pachanga

https://www.hackerrank.com/contests/ijmszfeelfqrwqfeyiaz/challenges/gallinas

https://oj.uz/problem/view/IOI17_prize

https://www.hackerrank.com/contests/practica-1-oie-2019/challenges/numeros-variados

https://www.hackerrank.com/contests/practica-1-oie-2019/challenges/lanzamiento-de-pelota