Grokking the Coding Interview: Patterns for Coding Questions
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Roman Pisani
Python Solution very fast very simple

Roman Pisani

Nov 22, 2024

def numGoodPairs(self, nums):
    pair_count = 0
    seen_nums = {}
    for num in nums:
      if num not in seen_nums:
        seen_nums[num] = 1
      else:
        pair_count += seen_nums[num]
        seen_nums[num] += 1
    return pair_count

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