Given an array containing n distinct numbers taken from 0, 1, 2, …, n, find the one that is missing from the array. For example,Given nums = [0, 1, 3] return...

Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. Example:12345Given nums = [-2, 0, 3, -5, 2, -1]sumRange...

Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6...

Implement the following operations of a queue using stacks. push(x) – Push element x to the back of queue.pop() – Removes the element from in front of queue....

Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 -> 2 -> 3 -&...

Given an integer, write a function to determine if it is a power of two. 12345678class Solution {public: bool isPowerOfTwo(int n) { if (n...

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) – Push element x onto stack.pop() – Removes the ele...

Given a singly linked list, determine if it is a palindrome. Follow up:Could you do it in O(n) time and O(1) space? 把前一半反转一下，然后用两个指针，将一个移到中间后，开始逐个看两个指针上的数据是否...

Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 一个笨办法是将每个节点插入一个unordered_map里，每次插入前去查一下是否已经存在，这...

Given an array of integers, every element appears twice except for one. Find that single one. Note:Your algorithm should have a linear runtime complexity. Co...