* Ciclu hamiltonian in $O(n^2^ * 2^n^)$
* Dinamicile in $3^n^$
** 'explicatie':http://forums.topcoder.com/?module=Thread&threadID=512824&start=0, 'problema':http://www.topcoder.com/stat?c=problem_statement&pm=6678&rd=9998&rm=249548&cr=8547850

* Arbore de cautare optim in $O(n^2)$

* 'Arbore de cautare optim in $O(n^2)$':http://www.ics.uci.edu/~dan/class/165/notes/OptBST.html

* Dinamici pe arbori
* Numarul posibilitatilor de acoperire a unei table cu dominouri
* Memoizare (trading space for time)