[LeetCode]#2367. Number of Arithmetic Triplets

Environment: Python 3.8

Key technique: in

You are given a 0-indexed, strictly increasing integer array nums and a positive integer diff. A triplet (i, j, k) is an arithmetic triplet if the following conditions are met:

  • i < j < k,
  • nums[j] - nums[i] == diff, and
  • nums[k] - nums[j] == diff.

Return the number of unique arithmetic triplets.

Example 1:


  1. Check nums[i]+diff and nums[i]+2*diff in nums







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