题目等级:Medium 题目描述:   You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.   You may…

题目等级:4Sum(Medium) 题目描述: Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target. Note: The solution se…

题目等级:3Sum(Medium) 题目描述: Given an array nums of n integers, are there elements a, b, c in nums such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not contain duplicate triplets. Exam…

[LeetCode]201. Bitwise AND of Numbers Range 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/bitwise-and-of-numbers-range/description/ 题目描述: Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers i…

题目等级:Easy 题目描述: Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanation: From left to right, it reads -12…

题目等级:4Sum II(Medium) 题目描述: Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero. To make problem a bit easier, all A, B, C, D have same length of N where 0 ≤ N ≤ 500…

Best Time to Buy and Sell Stock with Transaction Fee 题目等级:Medium 题目描述: Your are given an array of integers prices, for which the i-th element is the price of a given stock on day i; and a non-negative integer fee representing a transaction fee. You m…

题目等级:Hard 题目描述:   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 time complexity should be O(log (m+n)).   You may assume nums1 and nums2 cannot be both empty.   E…

Difficulty: Easy  More:[目录]LeetCode Java实现 Description https://leetcode.com/problems/sum-of-square-numbers/submissions/ Given a non-negative integer c, your task is to decide whether there're two integers aand b such that a2 + b2 = c. Example 1: Inpu…

package y2019.Algorithm.LinkedList.medium; import y2019.Algorithm.LinkedList.ListNode; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.LinkedList.medium * @ClassName: AddTwoNumbers * @Author: xiaof * @Description: TODO 2. Add Two Numbers…

package y2019.Algorithm.array; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: SumEvenAfterQueries * @Author: xiaof * @Description: 985. Sum of Even Numbers After Queries * * We have an array A of integers, and an arr…

真的感觉有点难... 这还是简单级别... 我也是醉了 package y2019.Algorithm.array; import java.math.BigDecimal; import java.util.ArrayList; import java.util.List; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: AddToArrayForm * @Author: xiao…

题目等级:Easy 题目描述: 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: 120 Output: 21    题意:给出一个 32 位的有符号整数,你需要将这个整数中每位上的数字进行反转. 解题思路:   本题很简单,我们给出以下两种方法.  …

题目等级:Medium 题目描述:   Given a string, find the length of the longest substring without repeating characters.   Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3.   Example 2: Input: "bbbbb…

题目等级:Easy 题目描述:   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 may not use the same element twice.   Example: Given…

说实话,这道题我没想出来,但是看解题报告题解比较让人觉得眼前一亮,这里记录下来 package y2019.Algorithm.greedy.medium; import java.util.Arrays; import java.util.LinkedList; /** * @Auther: xiaof * @Date: 2019/12/19 09:05 * @Description: 406. 根据身高重建队列 * * 假设有打乱顺序的一群人站成一个队列. 每个人由一个整数对(h, k)表示…

package y2019.Algorithm.dynamicprogramming.hard; /** * @Auther: xiaof * @Date: 2019/12/11 08:59 * @Description: 1278. 分割回文串 III * * 给你一个由小写字母组成的字符串 s,和一个整数 k. * 请你按下面的要求分割字符串: * 首先,你可以将 s 中的部分字符修改为其他的小写英文字母. * 接着,你需要把 s 分割成 k 个非空且不相交的子串,并且每个子串都是回文串.…

最近做leetcode总感觉自己是个智障,基本很少有题能自己独立做出来,都是百度... 不过终于还是做出了一题...而且速度效率还可以 哎,加油吧,尽量锤炼自己 package y2019.Algorithm.str.medium; import java.util.ArrayList; import java.util.List; /** * @Auther: xiaof * @Date: 2019/11/21 09:00 * @Description: 1023. Camelcase Mat…

package y2019.Algorithm.dynamicprogramming.medium; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.dynamicprogramming.medium * @ClassName: NumDecodings * @Author: xiaof * @Description: 91. Decode Ways * A message containing letters from…

package y2019.Algorithm.array.medium; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array.medium * @ClassName: SortColors * @Author: xiaof * @Description: TODO 75. Sort Colors * Given an array with n objects colored red, white or blue,…

package y2019.Algorithm.array.medium; import java.util.*; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array.medium * @ClassName: CombinationSum * @Author: xiaof * @Description: TODO 39. Combination Sum * Given a set of candidate numb…

package y2019.Algorithm.array.medium; import java.util.Arrays; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array.medium * @ClassName: ProductExceptSelf * @Author: xiaof * @Description: TODo 238. Product of Array Except Self * Given a…

package y2019.Algorithm.array.medium; import java.util.ArrayList; import java.util.List; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array.medium * @ClassName: PancakeSort * @Author: xiaof * @Description: TODO 969. Pancake Sorting *…

package y2019.Algorithm.array.medium; /** * @ClassName UniquePathsWithObstacles * @Description TODO 63. Unique Paths II * * A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). * The robot can only move eit…

第950题,这题我是真的没想到居然会说使用队列去做,大神的答案,拿过来瞻仰一下 package y2019.Algorithm.array; import java.util.HashMap; import java.util.Map; /** * @ClassName Exist * @Description TODO 79. Word Search * * Given a 2D board and a word, find if the word exists in the grid. *…

数组类,简单级别完结.... 不容易啊,基本都是靠百度答案.... 希望做过之后后面可以自己复习,自己学会这个解法 package y2019.Algorithm.array; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: CanPlaceFlowers * @Author: xiaof * @Description: TODO 605. Can Place Flowers * S…

package y2019.Algorithm.array; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: IsOneBitCharacter * @Author: xiaof * @Description: TODO 717. 1-bit and 2-bit Characters * We have two special characters. The first charac…

package y2019.Algorithm.array; import java.util.HashSet; import java.util.Set; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: FairCandySwap * @Author: xiaof * @Description: TODO 888. Fair Candy Swap * * Alice and Bob…

package y2019.Algorithm.array; import java.util.Arrays; import java.util.Stack; /** * @ClassName Rotate * @Description TODO 189. Rotate Array * * Given an array, rotate the array to the right by k steps, where k is non-negative. * * Input: [1,2,3,4,5…

package y2019.Algorithm.array; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: TwoSum2 * @Author: xiaof * @Description: 167. Two Sum II - Input array is sorted * Given an array of integers that is already sorted in as…