| 1651 | Orase | Mircea Bogdan Pasoi | preONI 2007 Runda Finala | N/A |
| 1652 | Orase1 | Ionel-Vasile Pit-Rada, Mihail-Cosmin Pit-Rada | Lot Vaslui 2014 - Baraj 3 Juniori | N/A |
| 1653 | Orase2 | Alexandru Velea | ONI 2017, clasa a 9-a | N/A |
| 1654 | Order | Cosmin Silvestru Negruseri | Bursele Agora 2004 |      3/5 |
| 1655 | Order 2 | Cristian Cadar | Lista lui Francu | N/A |
| 1656 | Order3 | Adrian Panaete | ONI 2017, clasele 11-12 | N/A |
| 1657 | Ordine | Adrian Airinei | preONI 2008 Runda 1 | N/A |
| 1658 | Ordini | Filip Cristian Buruiana | Junior Challenge | N/A |
| 1659 | Ordonare | Bogdan Pop | Concurs de incalzire 2020 | N/A |
| 1660 | Orient | Vlad Ionescu | Infoarena Monthly 2012, Runda 6 | N/A |
| 1661 | Origami | Alin Burta | ONI 2009 clasa a 9-a | N/A |
| 1662 | Origami2 | Eugenie Daniel Posdarascu, Lucian Bicsi | ONI 2017, Baraj | N/A |
| 1663 | Ostrov | Chichirim George | Concursul National de Informatica "Adolescent Grigore Moisil" 17 | N/A |
| 1664 | Otilia | Silviu-Ionut Ganceanu | .campion 2005 |      5/5 |
| 1665 | Overdrive | Eugenie Daniel Posdarascu | Algoritmiada 2015 Runda 3 | N/A |
| 1666 | Overlap | Adrian Diaconu, Cosmin Silvestru Negruseri, Tiberiu-Lucian Florea | preONI 2006 Runda Finala |      4/5 |
| 1667 | Overpower | Theodor Moroianu | Junior Challenge 2019 | N/A |
| 1668 | Oxificare | Andrei Popa, Radu Muntean | Algoritmiada 2017, Runda Finala, Seniors | N/A |
| 1669 | Oxificare Light | Andrei Popa, Radu Muntean | Algoritmiada 2017, Runda Finala, Juniors | N/A |
| 1670 | Oypara | Alexandru Mosoi | Lot 2006 Alba | N/A |
| 1671 | Oz | Filip Cristian Buruiana | preONI 2008, Runda finala | N/A |
| 1672 | P-sir | Mircea Bogdan Pasoi | preONI 2007 Runda Finala | N/A |
| 1673 | Pachete | Mircea Bogdan Pasoi | preONI 2007, Runda 1 |      3/5 |
| 1674 | Padurari | Din Folclor | Summer Challenge 2009, Runda 2 | N/A |
| 1675 | Padure | Silviu-Ionut Ganceanu | Stelele Informaticii 2006, clasele 9-10 |      3/5 |
| 1676 | Padure2 | Vlad Turcuman | ACM ICPC - Romanian Programming Contest 2016 | N/A |
| 1677 | Paduri de multimi disjuncte | Arhiva Educationala | Arhiva educationala | N/A |
| 1678 | Pagina | Teodor Plop | Infoarena Monthly 2012, Runda 12 | N/A |
| 1679 | Paginatie | Stefan Alexandru Filip | Algoritmiada 2012, Runda 3 | N/A |
| 1680 | Paintball | Mircea Bogdan Pasoi | Lot Iasi 2008, Baraj 6 | N/A |
| 1681 | Painting | Mihai Calancea | ad-hoc | N/A |
| 1682 | Pairs | Filip Cristian Buruiana | preONI 2008 Runda 1 | N/A |
| 1683 | Pal | Silviu-Ionut Ganceanu | ONI 2005 |      4/5 |
| 1684 | Pal2 | Andrei Heidelbacher, Mihai Calancea | Algoritmiada 2014, Runda Finala | N/A |
| 1685 | Palalila2 | Vlad Duta | FMI No Stress 2010 | N/A |
| 1686 | Palatulvoltaic | Tamio-Vesa Nakajima | Algoritmiada 2019 Runda Maraton | N/A |
| 1687 | Pali | Mugurel Ionut Andreica | Happy Coding 2007 | N/A |
| 1688 | Palin3 | Cazacu Alexandru, Mihai Calancea | FMI No Stress 4 | N/A |
| 1689 | Palind2 | Adrian Airinei | ONI 2008, clasa a 9-a | N/A |
| 1690 | Palindroame | Mugurel Ionut Andreica | Happy Coding 2 |      2/5 |
| 1691 | Palindrom | Marius Stroe | Grigore Moisil 2009, clasele 11-12 | N/A |
| 1692 | Palindrom2 | Marius Stroe | Grigore Moisil 2009, clasele 5-8 | N/A |
| 1693 | Palindrom3 | Alexandru Cazacu, Cosmin-Mihai Tutunaru, Dragos Oprica, Robert Hasna, Vlad Duta, Vlad Ionescu | ONI 2012 - clasa a 9-a | N/A |
| 1694 | Palindrom4 | Ene Dumitriu | ProSoft@NT 2017 | N/A |
| 1695 | PalM | Mihai-Alexandru Dusmanu | .com 2011 | N/A |
| 1696 | Palmieri | Paul-Dan Baltescu | Algoritmiada 2010, Runda 2 | N/A |
| 1697 | Palsubsecv | Florin Chirica | Concursul National de Informatica "Adolescent Grigore Moisil" |      5/5 |
| 1698 | Pamant | Carmen Popescu | ONI 2011, clasele 11-12 | N/A |
| 1699 | Panamasum | Stefan Dascalescu | IIOT 2022-23 Runda 1 | N/A |
| 1700 | Panda | Adriana Simulescu | OJI 2015, clasa a 10a | N/A |