题目内容

BFS will always run faster than DFS.

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Consider the new version of DFS. This traverses paths until all non-circular paths from the source to the destination have been found, and returns the shortest one.Let A be the source node, and B be the destination in KN. How many paths of length 2 exist from A to B?______

For questions 3 and 4, consider the general case of our previous problem (permutations of n students in a line). Give your answer in terms of n.When represented as a tree, each node will have how many children?______

Given two permutations, what is the maximum number of swaps it will take to reach one from the other?______

For questions 1 and 2, consider our previous problem (permutations of 3 students in a line).When represented as a tree, each node will have how many children?______