Letter Combinations of a Phone Number, solution in C++

Given a collection of numbers that might contain duplicates, return all possible unique permutations

Given two integers n and k, return all possible combinations of k numbers out of 1 … n in CPP

Given a set of distinct integers, nums, return all possible subsets in CPP

Given 2D matrix and a word, find if the word exists in the grid in C++

Given array of integers that might contain duplicates, return all the subsets. Solution in CPP