#Graph Theory

Discuss the algorithm to solve the problem of finding the cheapest flights within K stops and analyze its efficiency.

Given edges between countries and a list of banned countries, find the shortest path from the source to the destination while minimizing visits to banned countries.

Given a list of edges representing connections between countries (0 to n-1) and a list of banned countries that cannot be visited, find the shortest path from a specified source to a destination. Use BFS and keep track of previous countries.