#codenewbies

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Single number · Q25:Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. You must implement a...

Rat in a maze · Q24:Consider a rat placed at (0, 0) in a square matrix of order N * N. It has to reach the destination at (N - 1, N - 1). Find all...

Letter combination of a phone number · Q22: Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number...

Combination II · Q21:Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where...

Permutations Sequence · Q19:The set [1, 2, 3, ..., n] contains a total of n! unique permutations. By listing and labeling all of the permutations in...

Permutations · Q18:Given an array nums of distinct integers, return all the possible permutations. You can return the answer in any order. Example...