beautiful triplets hackerrank solution in python
def beautifulTriplets(d, arr):
a = set(arr)
return len([1 for i in arr if i+d in a and i+d*2 in a])
n,d = map(int,input().split())
arr = list(map(int,input().split()))
print(beautifulTriplets(d, arr))Copyright © 2021 Codeinu
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