*** Preferabil ca a doua dimensiune sa fie un aib rar (alaturi de lista de elemente ordonate crescator)
** Probleme persistent: 'ants':http://varena.ro/problema/ants, 'kthvalue':problema/kthvalue, 'CF 786C':http://codeforces.com/problemset/problem/786/C
** Li Chao: '1':http://codeforces.com/blog/entry/44821?#comment-294049, '2':http://codeforces.com/blog/entry/51275?#comment-351413

*** Probleme: 'euro':problema/euro, 'Organizing a race':http://codeforces.com/contest/671/problem/E

* 'Structuri de multimi disjuncte':http://algopedia.ro/wiki/index.php/Clasele_9-10_lec%C8%9Bia_5_-_15_oct_2014
** 'e-maxx':http://e-maxx.ru/algo/dsu
** 'Arhiva Educationala':problema/disjoint