Reverse a singly linked list
Given a reference to the head of a singly linked list, reverse it and return a reference to the head of the reversed list.
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Coding puzzles for software engineering interviews
Worked solutions to common interview problems, with the reasoning, complexity analysis, and edge cases that actually matter in the room.
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Sum of two elements (2sum)
Given an array of integers and an integer target, return indices of the two numbers such that they add up to the target.
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