Problem Collection
We have many ways for you to practice for upcoming competitions:
To search problems or browse by venues, languages, etc., check out the NACLO problem database
NACLO 2021 Problems
NACLO 2020 Problems
NACLO 2019 Problems
NACLO 2018 Problems
NACLO 2017 Problems
NACLO 2016 Problems
NACLO 2015 Problems
NACLO 2014 Problems
NACLO 2013 Problems
NACLO 2012 Problems
NACLO 2011 Problems
NACLO 2010 Problems
NACLO 2009 Problems
NACLO 2008 Problems
NACLO 2007 Problems
Student Contributed Problems
NACLO Online Practice
NACLO Online Practice is an interactive online system that allows you to practice with problems from previous competitions and have them automatically scored. Below is a list of problems that are included in this system. Click on a problem's title to be taken to that problem's page.
Sample Practice Problems
Problems from Other Sources

Quick Links
Student Registration
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Practice Problems
Challenge yourself online with practice problems
Handbook
All you need to know about NACLO in one place
NACLO Resources
Suggested reading, links, etc.
