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Implementing a social network

You're developing a social networking application that needs to analyze potential connections between users. You need to implement a method that generates all possible pairs of users from a list.

说明

100 XP
  • For each index i, assign the ith user in elements as the first element of the pair.
  • For each index j, assign the jth user in elements as the second element of the pair.
  • Return the result with all your pairs.