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网上找了不少答案，都不满意，算了还是自己做吧。Problem DescriptionA number sequence is defined as follows:f(1) = 1, f(2) = 1, f(n) = (A * f(n - 1) + B * f(n - 2)) mod 7.Given A, B, and n, you are to calcu

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题目来源：https://leetcode.com/problems/regular-expression-matching/Regular Expression Matching‘.’匹配任意单个字符，‘*’匹配0个或多个前一字符。如果匹配整个串返回true。例：isMatch("aa","a") → falseisMatch("aa","aa")

题目来源：https://leetcode.com/problems/palindrome-number/Determine whether an integer is a palindrome. Do this without extra space.click to show spoilers.Some hints:Could negative integers be palindrome

题目来源：https://leetcode.com/problems/reverse-integer/Reverse digits of an integer.Example1: x = 123, return 321Example2: x = -123, return -321click to show spoilers.Have you thought about this?Here ar

题目来源：https://leetcode.com/problems/zigzag-conversion/The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a

问题来源：https://leetcode.com/problems/string-to-integer-atoi/Implement atoi to convert a string to an integer.Hint: Carefully consider all possible input cases. If you want a challenge, please do not

问题来源：https://leetcode.com/problemset/algorithms/Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one uni

题目来源：https://leetcode.com/problems/median-of-two-sorted-arrays/There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run t

问题描述：https://leetcode.com/problems/two-sum/Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the

题目来源：https://leetcode.com/problems/longest-substring-without-repeating-characters/Given a string, find the length of the longest substring without repeating characters. For example, the longest su

问题描述：https://leetcode.com/problems/two-sum/Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers s

转载自：lhttp://www.cnblogs.com/jcliBlogger/p/4548751.htmlWell, this problem desires for the use of dynamic programming. They key to any DP problem is to come up with the state equation. In this pro

最近较忙，没怎么写LeetCode以后尽量保证每天一道题目以上。 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum o