Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements ...

Design a class to find the kth largest element in a stream. Note that it is the kth largest element in the sorted order, not the kth distinct element. ...

Find the kth largest element in an unsorted array. Note that it is the kth largest element in the sorted order, not the kth distinct element. ExampleN ...

Follow up Zigzag Iterator: What if you are given k 1d vectors? How well can your code be extended to such cases? The “Zigzag” order is not clearly def ...

Given two 1d vectors, implement an iterator to return their elements alternately. ExampleNo.1Input: v1 = [1, 2] and v2 = [3, 4, 5, 6] Output: [1, 3, 2 ...

Given a non-negative integer represented as non-empty a singly linked list of digits, plus one to the integer. You may assume the integer do not conta ...

In this problem, each process has a unique PID (process id) and PPID (parent process id). Each process only has one parent process, but may have one o ...

During the NBA playoffs, we always arrange the rather strong team to play with the rather weak team, like make the rank 1 team play with the rank nth ...

Given a 2d grid map of ‘1’s (land) and ‘0’s (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacen ...

Given a binary tree, collect a tree’s nodes as if you were doing this: Collect and remove all leaves, repeat until the tree is empty. ExampleNo.1Input ...