DuoAlgo-lessons Resurse: https://cppi.sync.ro/materia/tipuri_de_date_operatori_citire_scriere_atribuire.html https://www.algopedia.ro/wiki/index.php/Main_Page https://codeforces.com/blog/tourist https://codeforces.com/blog/AlexLuchianov Intersecție de matroizi: https://codeforces.com/blog/entry/69287