* Intersectie a doua segmente
* Punct in interiorul unui poligon
* Punct in poligon convex in $O(log n)$

* Aria unui poligon

* 'Teorema lui Pick':http://www.cut-the-knot.org/ctk/Pick_proof.shtml
** problema 'copaci':problema/copaci

* Aria unui poligon

* Centrul de greutate al unui poligon
* 'Triangularizare de poligon in $O(n^2)$':http://people.csail.mit.edu/indyk/6.838-old/handouts/lec4.pdf

* 'Intersectia a doua cercuri':http://local.wasp.uwa.edu.au/~pbourke/geometry/2circle/

* Intersectia a doua cercuri

* 'Minimal enclosing circle':minimal-enclosing-circle
* Convex hull
* 'Baleiere verticala / radiala':algoritmi-de-baleiere

** problema 'camera':problema/camera
* Dualizare (intersectie de semiplane, diagrame Voronoi)

* 'thread pe forum':http://infoarena.ro/forum/index.php?topic=3007.0
 

h3. Sortari si cautari
* Shell sort, merge sort, heapsort, quicksort, counting sort, radix sort