C/C++

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Given an array nums of size n, return the majority element.

The majority element is the element that appears more than ⌊n / 2⌋ times. You may assume that the majority element always exists in the array.

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Given string num representing a non-negative integer num, and an integer k, return the smallest possible integer after removing k digits from num.

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Given a non-empty array of integers nums, every element appears twice except for one. Find that single one.

You must implement a solution with a linear runtime complexity and use only constant extra space.

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Given an integer array nums of unique elements, return all possible subsets (the power set).

The solution set must not contain duplicate subsets. Return the solution in any order.

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Given two strings s1 and s2, return true if s2 contains a permutation of s1, or false otherwise.

In other words, return true if one of s1's permutations is the substring of s2.

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You are given two strings s and t.

String t is generated by random shuffling string s and then add one more letter at a random position.
Return the letter that was added to t.

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