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Find pairs with sum X from a list of numbers

Python/Codingeasy0.1 min readPremium
Frequency
Low
Asked at 1 company
Category
179
questions in Python/Coding
Difficulty Split
127E|24M|28H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Paytm
Expert AnswerPremium
25 wordsInterview-ready
**Hash set:** For each num, if (X-num) in seen, count pair. Add num to seen. O(n). **Duplicates:** Counter. **Why:** One pass. **Production:** Handle overflow; duplicates.
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