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原题链接：Reverse Integer 题目内容： Given a 32-bit signed integer, reverse digits of an integer. Example 1: Input: 123 Output: 321 Example 2: Input: -123 Output: -321 Example 3: Input:...

原题链接：Reverse Linked List 题目内容： Reverse a singly linked list. Example: Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL

原题链接：Remove Nth Node From End of List 题目内容： Given a linked list, remove the n-th node from the end of list and return its head. Example: Given linked list: 1->2->3->4->5, and n = 2....

原题链接：Merge Sorted Array 题目内容： Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1 as one sorted array. Note: The number of elements initialized in nums1 and nums2 are m and n r...

原题链接：Valid Anagram 题目内容： Given two strings s and t, write a function to determine if t is an anagram of s. For example, s = “anagram”, t = “nagaram”, return true. s = “rat”, t = “car”, return fa...

原题链接：First Unique Character in a String 题目内容： Given a string, find the first non-repeating character in it and return it’s index. If it doesn’t exist, return -1. Examples: s = “leetcode” re...

原题链接：Reverse String 题目内容： Write a function that takes a string as input and returns the string reversed. Example: Given s = “hello”, return “olleh”. Python class Solution(object): def...

原题链接：Power of Three 题目内容： Given an integer, write a function to determine if it is a power of three. Follow up: Could you do it without using any loop / recursion? Credits: Special thanks to @d...

原题链接：Count Primes 题目内容： Description: Count the number of prime numbers less than a non-negative number, n. Credits: Special thanks to @mithmatt for adding this problem and creating all test cases...

原题链接：String to Integer (atoi) 题目内容： Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask your...

原题链接：Plus One 题目内容：Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. You may assume the integer do not contain any leading zero, except the number 0 i...

原题链接：Implement strStr() 题目内容： Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. Example 1: Input: haystack = “hello”, needle = “ll” Out...

原题链接：Longest Common Prefix 题目内容： Write a function to find the longest common prefix string amongst an array of strings. 找到字符列表中的最长前缀，注意[], [“”], [“a”, “a”]这样的例子 Python class Solution(object): ...

原题链接：Count and Say 题目内容： The count-and-say sequence is the sequence of integers with the first five terms as following: 1 11 21 1211 111221 1 is read off as “one 1” or 11. 11 i...

原题链接：Valid Palindrome 题目内容： Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, “A man, a plan, a canal: Panama” is a pa...

原题链接：Two Sum 题目内容：Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you ma...

原题链接：Fizz Buzz 题目内容：Write a program that outputs the string representation of numbers from 1 to n. But for multiples of three it should output “Fizz” instead of the number and for the multiples of f...

原题链接：Valid Sudoku 题目内容：Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are filled with the character ‘.’. A...

原题链接：Move Zeroes 题目内容：Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative order of the non-zero elements. For example, given nums = [0, 1, 0, 3, 12]...