Number of Good Pairs (easy)

Grokking the Coding Interview: Patterns for Coding Questions

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Python solution using Counter

Toni Dezman

May 17, 2025

from collections import Counter

class Solution:
  def numGoodPairs(self, nums):
    seen = Counter()
    res = 0
    for num in nums:
        res += seen[num]
        seen[num] += 1
    return res

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