This project contains several from-scratch solutions from POJ, which stands for Peking University Online Judgement, a website where we can see many problems from many famous coding competitions.
Each source file has a header that tells you the actual problem number:
/*
* @file <file name>
* @brief POJ <problem no.>
*/You may access the description of the problem by the following rule:
http://poj.org/problem?id=<problem no.>
e.g. POJ 1057 can be accessed by http://poj.org/problem?id=1057