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Given an integer array and another number, find a pair whose sum is given number. Best solution is to use unordered map <int, int> then use this logic map[sum - a[i]] = a[i]; // O(n) then, for each a[i], if map[a[i]] present then that will be the answer. // O(n)
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C++ Senior Software Developer - Diagnostic Architecture

Interviewed at MathWorks

4.3★
Feb 27, 2018

Given an integer array and another number, find a pair whose sum is given number. Best solution is to use unordered map <int, int> then use this logic map[sum - a[i]] = a[i]; // O(n) then, for each a[i], if map[a[i]] present then that will be the answer. // O(n)

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