[Point72] OA 2025 start – 11 Apr (quant prep mode)

Get Triplet Count

Function Description

Complete the function getTripletCount in the editor below. The function must return an integer denoting the total number of distinct triplets.

def getTripletCount(arr, d):
    # implementation

Parameters

  • int arr[n]: array of integers
  • int d: the divisor

Example 1

Input

arr = [3, 3, 4, 7, 8]
d = 5

Output

3

Explanation

Triplets whose sum is divisible by d:

  • Triplet with indices (0, 1, 2), sum = 3 + 3 + 4 = 10
  • Triplet with indices (0, 2, 4), sum = 3 + 4 + 8 = 15
  • Triplet with indices (1, 2, 4), sum = 3 + 4 + 8 = 15

Hence, the answer is 3.

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