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  1. Count Triplets
  2. Discussions

Count Triplets

  • radialapps
     + 15 comments

    Amazing! Looks a bit shorter with defaultdict:

    def countTriplets(arr, r):
    v2 = defaultdict(int)
    v3 = defaultdict(int)
    count = 0
    for k in arr:
        count += v3[k]
        v3[k*r] += v2[k]
        v2[k*r] += 1

    return count