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| Număr | Titlul problemei | Autor(i) | Sursă | Dificultate |
|---|---|---|---|---|
| 2801 | Zimeria | Daniel Popa | ONI 2014, clasa a 10-a |   2/5 |
| 2802 | Zip | Csaba Patcas | Grigore Moisil 2008, clasele 11-12 | N/A |
| 2803 | Zlego | Andrei Parvu | ONI 2012 - clasele 11-12 | N/A |
| 2804 | Zmeu | Cosmin Bondane | ad-hoc | N/A |
| 2805 | Zmeu2 | Dana Lica | OJI 2003, clasele 11-12 | N/A |
| 2806 | Zombie | Eugenie Daniel Posdarascu | .com 2011 | 1/5 |
| 2807 | Zombies | Lucian Bicsi | Lot Seniori Deva, 2019, baraj 1 | N/A |
| 2808 | Zona | Radu Visinescu | OJI 2013, clasa a 10-a | N/A |
| 2809 | Zone | Filip Cristian Buruiana | preONI 2007, Runda 2 | 3/5 |
| 2810 | Zone 2 | Andrei Ciocan | ONI 2013, clasa a 10-a | N/A |
| 2811 | Zoo | Mugurel Ionut Andreica | .campion 2003 | 5/5 |
| 2812 | Zoro | Eugenie Daniel Posdarascu | Algoritmiada 2018 Runda PreOJI | N/A |
| 2813 | Zota & Chidil | Adrian Vladu | preONI 2006 Runda 2 | 2/5 |
| 2814 | ZParcurgere | Mihai Pantis | Grigore Moisil By Net 2006 | 1/5 |
| 2815 | Zuma | Bogdan Ciobanu | ONI 2018, clasele 11-12, ziua 2 | N/A |
| 2816 | Zumzi | Carmen Popescu | ONI 2006, clasa a IX-a | N/A |
| 2817 | Zuzu | Doru Popescu Anastasiu | Lot Suceava 2007 | N/A |
| 2818 | Zvon | Mugurel Ionut Andreica | Happy Coding 2007 | N/A |
| 2819 | Zzid | ad-hoc | N/A |
