I participated in the codeforces educational round 4 and I liked problem E (Square Root of Permutation) that involves finding square root of a given permutation. The solution requires representing the permutation as a graph then decomposing this graph into cycles. Checking certain properties of these cycles such as the number of even cycles with the same length is the key point to finding a solution.
The idea of considering a permutation as a graph and mapping operations on the permutation to operations in the corresponding graph is very new and interesting to me. I tried to search in Google and Codeforces about other problems and explanations related to this concept but I was not able to find relevant stuff other than: Wikipedia article and a codechef problem. I wonder whether you can share some resources about this topic that you might have met during practice or suggest better keywords for finding relevant resources.