Скачать или смотреть List of Lists LISTLIST Solution Codechef

#List_of_Lists_Solution
Description:
You are given a positive integer N and an array A of size N. There are N lists L1,L2…LN. Initially, Li=[Ai].

You can perform the following operation any number of times as long as there are at least 2 lists:

Select 2 (non-empty) lists Li and Lj (i≠j)
Append Lj to Li and remove the list Lj. Note that this means Lj cannot be chosen in any future operation.
Find the minimum number of operations required to obtain a set of lists that satisfies the following conditions:

The first element and last element of each list are equal.
The first element of all the lists is the same.
Print −1 if it is not possible to achieve this via any sequence of operations.

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Problem Link :
December Long Challenge: https://cybergeeksquad.co/2021/12/dec...

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