Round #538: another one plagiarism
Problem C:
https://www.geeksforgeeks.org/largest-power-k-n-factorial-k-may-not-prime/.
https://acmp.ru/index.asp?main=task&id_task=200
https://www.quora.com/How-do-I-find-the-number-of-trailing-zeroes-of-N-factorial-in-Base-B
Or it faster to solve by yourself than find the solution on the internet?
CodeChef Starters 131 Solution Discussion