Find the unique element in an array where all elements …

Imagine an array that contains both integers and nested…

You are given K sorted integer arrays (non-decreasing)….

Given the root of a binary search tree, return a balanc…

Given the root of a binary tree containing integers, re…

Problem (English original):Given a string S consisting …

Problem (verbatim):“A multiset (also known as a bag) is…

Problem (verbatim):“Given an integer array and an integ…

Problem Statement (English original)Assume a binary-tre…

Problem Statement (English original)You are given a cur…