We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
  1. Count Triplets
  2. Discussions

Count Triplets

  • SagunB
     + 16 comments

    Brilliant solution. Helped me a tonne! Equivalent code in python:

    from collections import Counter

def countTriplets(arr, r):
    r2 = Counter()
    r3 = Counter()
    count = 0
    
    for v in arr:
        if v in r3:
            count += r3[v]
        
        if v in r2:
            r3[v*r] += r2[v]
        
        r2[v*r] += 1

    return count