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What is Count Pairs with Given Sum in Arrays about?

The document describes three methods to count pairs in an array that sum to a given integer k. The brute-force solution has a time complexity of O(n²), the optimized solution using sorting and two pointers has a complexity of O(n log n), and the most efficient solution using a hash map operates in O(n) time. Each method has its own limitations regarding performance and space usage.

Author

prathmeshkarale2006

Language

EN