Problem Collection
We have many ways for you to practice for upcoming competitions:
This list of solve rates of past problems may help you determine which problems to practice based on your experience.
NACLO 2024 Problems
Some PDFs and solutions are not available yet (they are marked with *). Check back later!
NACLO 2023 Problems
NACLO 2022 Problems
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
Register for the next competition
Practice Problems
Challenge yourself online with practice problems
Student Handbook
All you need to know about NACLO for students
Coordinator Handbook
All you need to know about NACLO for coordinators
NACLO Resources
Suggested reading, links, etc.
Login
Log in to view/edit your information.
