原创 258. Add Digits
Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. For example: G
2020-02-21 11:26:18
原创 264. Ugly Number II
Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose prime factors only include 2,
2020-02-21 11:26:18
原创 260. Single Number III
Given an array of numbers nums, in which exactly two elements appear only once and all the other elements appear ex
2020-02-21 11:26:18
原创 283. Move Zeroes
Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative order of the
2020-02-21 11:26:17
原创 268. Missing Number
Given an array containing n distinct numbers taken from 0, 1, 2, …, n, find the one that is missing from the array.
2020-02-21 11:26:17
原创 279. Perfect Squares
Given a positive integer n, find the least number of perfect square numbers (for example, 1, 4, 9, 16, …) which sum
2020-02-21 11:26:17
原创 289. Game of Life
According to the Wikipedia’s article: “The Game of Life, also known simply as Life, is a cellular automaton devised
2020-02-21 11:26:17
原创 240. Search a 2D Matrix II
Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties
2020-02-21 11:26:17
原创 287. Find the Duplicate Number
Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at leas
2020-02-21 11:26:17
原创 284. Peeking Iterator
Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that s
2020-02-21 11:26:17
原创 237. Delete Node in a Linked List
Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Suppos
2020-02-21 11:26:17
原创 242. Valid Anagram
Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = “anagram”, t =
2020-02-21 11:26:17
原创 275. H-Index II
Follow up for H-Index: What if the citations array is sorted in ascending order? Could you optimize your algorithm?
2020-02-21 11:26:17
原创 274. H-Index
Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute
2020-02-21 11:26:17
原创 263. Ugly Number
Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime fa
2020-02-21 11:26:16