International Collegiate Programming Contest, Egyptian Collegiate Programming Contest (ECPC 2018) D. The Millennium Prize Problems 求有公约数x的所有数对之积,那么最大公约数为x的乘积只需要约数有x减掉最大公约数为2x,3x的数对之积。 E. Count Perm
Keshta, Ismail, and Ammar Odeh. "Security and privacy of electronic health records: Concerns and challenges." Egyptian Informatics Journal 22.2 (2021): 177-183. https://doi.org/10.1016/j.eij.2020.07.0