吴中乐-CSDN博客

原创剑指 Offer 15. 二进制中1的个数（Medium）（JAVA）

剑指 Offer 15. 二进制中1的个数（Medium）（JAVA）题目地址: https://leetcode-cn.com/problems/er-jin-zhi-zhong-1de-ge-shu-lcof/题目描述：请实现一个函数，输入一个整数（以二进制串形式），输出该数二进制表示中 1 的个数。例如，把 9 表示成二进制是 1001，有 2 位是 1。因此，如果输入 9，则该函数输出 2。示例 1：输入：00000000000000000000000000001011输出：3

2021-06-23 09:17:28 255

原创剑指 Offer 38. 字符串的排列（Medium）（JAVA）每日一题

剑指 Offer 38. 字符串的排列（Medium）（JAVA）题目地址: https://leetcode-cn.com/problems/zi-fu-chuan-de-pai-lie-lcof/题目描述：输入一个字符串，打印出该字符串中字符的所有排列。你可以以任意顺序返回这个字符串数组，但里面不能有重复元素。示例:输入：s = "abc"输出：["abc","acb","bac","bca","cab","cba"]限制：1 <= s 的长度 <= 8解题方法要找

2021-06-22 09:28:33 279

原创【LeetCode】 1600. Throne Inheritance 皇位继承顺序（Medium）（JAVA）

【LeetCode】 1600. Throne Inheritance 皇位继承顺序（Medium）（JAVA）题目地址: https://leetcode.com/problems/throne-inheritance/题目描述：A kingdom consists of a king, his children, his grandchildren, and so on. Every once in a while, someone in the family dies or a child is

2021-06-20 10:12:38 305

原创【LeetCode】232. Implement Queue using Stacks 用栈实现队列（Easy）（JAVA）每日一题

【LeetCode】232. Implement Queue using Stacks 用栈实现队列（Easy）（JAVA）题目地址: https://leetcode.com/problems/implement-queue-using-stacks/题目描述：Implement a first in first out (FIFO) queue using only two stacks. The implemented queue should support all the functions

2021-03-05 09:08:16 171 1

原创【LeetCode】354. Russian Doll Envelopes 俄罗斯套娃信封问题（Hard）（JAVA）每日一题

【LeetCode】354. Russian Doll Envelopes 俄罗斯套娃信封问题（Hard）（JAVA）题目地址: https://leetcode.com/problems/russian-doll-envelopes/题目描述：You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope can fit into another if an

2021-03-04 09:43:44 135 1

原创【LeetCode】338. Counting Bits 比特位计数（Medium）（JAVA）每日一题

【LeetCode】338. Counting Bits 比特位计数（Medium）（JAVA）题目地址: https://leetcode.com/problems/counting-bits/题目描述：Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’s in their binary representation and r

2021-03-03 09:18:48 96

原创【LeetCode】303. Range Sum Query - Immutable 区域和检索 - 数组不可变（Easy）（JAVA）

【LeetCode】303. Range Sum Query - Immutable 区域和检索 - 数组不可变（Easy）（JAVA）题目地址: https://leetcode.com/problems/range-sum-query-immutable/题目描述：Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.Implement the&nb

2021-03-01 08:59:10 112

原创【LeetCode】867. Transpose Matrix 转置矩阵（Easy）（JAVA）

【LeetCode】867. Transpose Matrix 转置矩阵（Easy）（JAVA）题目地址: https://leetcode.com/problems/transpose-matrix/题目描述：Given a 2D integer array matrix, return the transpose of matrix.The transpose of a matrix is the matrix flipped over its main diagonal, switching

2021-02-25 09:01:32 161

原创【LeetCode】832. Flipping an Image 翻转图像（Easy）（JAVA）

【LeetCode】832. Flipping an Image 翻转图像（Easy）（JAVA）题目地址: https://leetcode.com/problems/perfect-squares/题目描述：Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image.To flip an image horizontally mean

2021-02-24 11:53:44 106

原创【LeetCode】1052. Grumpy Bookstore Owner 爱生气的书店老板（Medium）（JAVA）

【LeetCode】1052. Grumpy Bookstore Owner 爱生气的书店老板（Medium）（JAVA）题目地址: https://leetcode.com/problems/grumpy-bookstore-owner/题目描述：Today, the bookstore owner has a store open for customers.length minutes. Every minute, some number of customers (customer

2021-02-23 09:09:33 173

原创【LeetCode】766. Toeplitz Matrix 托普利茨矩阵（Easy）（JAVA）

【LeetCode】766. Toeplitz Matrix 托普利茨矩阵（Easy）（JAVA）题目地址: https://leetcode.com/problems/toeplitz-matrix/题目描述：Given an m x n matrix, return true if the matrix is Toeplitz. Otherwise, return false.A matrix is Toeplitz if every diagonal from top-le

2021-02-22 09:05:41 146

原创【LeetCode】697. Degree of an Array 数组的度（Easy）（JAVA）

【LeetCode】697. Degree of an Array 数组的度（Easy）（JAVA）题目地址: https://leetcode.com/problems/degree-of-an-array/题目描述：Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements.

2021-02-20 09:00:04 128

原创【LeetCode】1004. Max Consecutive Ones III 最大连续1的个数 III（Medium）（JAVA）

【LeetCode】1004. Max Consecutive Ones III 最大连续1的个数 III（Medium）（JAVA）题目地址: https://leetcode.com/problems/max-consecutive-ones-iii/题目描述：Given an array A of 0s and 1s, we may change up to K values from 0 to 1.Return the length of the longest (contiguous) s

2021-02-19 09:33:58 134 1

原创【LeetCode】1631. Path With Minimum Effort 最小体力消耗路径（Medium）（JAVA）每日一题

【LeetCode】1631. Path With Minimum Effort 最小体力消耗路径（Medium）（JAVA）题目描述：You are a hiker preparing for an upcoming hike. You are given heights, a 2D array of size rows x columns, where heights[row][col] represents the height of cell (row, col). You are situat

2021-01-29 09:43:05 168

原创【LeetCode】724. Find Pivot Index 寻找数组的中心索引（Easy）（JAVA）每日一题

【LeetCode】724. Find Pivot Index 寻找数组的中心索引（Easy）（JAVA）题目地址: https://leetcode.com/problems/find-pivot-index/题目描述：Given an array of integers nums, write a method that returns the “pivot” index of this array.We define the pivot index as the index where the

2021-01-28 09:11:06 128 1

原创【LeetCode】1128. Number of Equivalent Domino Pairs 等价多米诺骨牌对的数量（Easy）（JAVA）每日一题

【LeetCode】1128. Number of Equivalent Domino Pairs 等价多米诺骨牌对的数量（Easy）（JAVA）题目地址: https://leetcode.com/problems/number-of-equivalent-domino-pairs/题目描述：Given a list of dominoes, dominoes[i] = [a, b] is equivalent to dominoes[j] = [c, d] if and only if eithe

2021-01-26 09:21:44 117

原创【LeetCode】989. Add to Array-Form of Integer 数组形式的整数加法（Easy）（JAVA）每日一题

【LeetCode】989. Add to Array-Form of Integer 数组形式的整数加法（Easy）（JAVA）题目地址: https://leetcode.com/problems/add-to-array-form-of-integer/题目描述：For a non-negative integer X, the array-form of X is an array of its digits in left to right order. Fo

2021-01-22 08:49:37 106

原创【LeetCode】628. Maximum Product of Three Numbers 三个数的最大乘积（Easy）（JAVA）每日一题

【LeetCode】628. Maximum Product of Three Numbers 三个数的最大乘积（Easy）（JAVA）题目地址: https://leetcode.com/problems/maximum-product-of-three-numbers/题目描述：Given an integer array nums, find three numbers whose product is maximum and return the maximum product.Exampl

2021-01-20 09:05:07 99

原创【LeetCode】947. Most Stones Removed with Same Row or Column 移除最多的同行或同列石头（Medium）（JAVA）每日一题

【LeetCode】947. Most Stones Removed with Same Row or Column 移除最多的同行或同列石头（Medium）（JAVA）题目地址: https://leetcode.com/problems/minimum-increment-to-make-array-unique/题目描述：On a 2D plane, we place n stones at some integer coordinate points. Each coordinate poin

2021-01-15 09:24:05 113

原创【LeetCode】1018. Binary Prefix Divisible By 5 可被 5 整除的二进制前缀（Easy）（JAVA）每日一题

【LeetCode】1018. Binary Prefix Divisible By 5 可被 5 整除的二进制前缀（Easy）（JAVA）题目地址: https://leetcode.com/problems/binary-prefix-divisible-by-5/题目描述：Given an array A of 0s and 1s, consider N_i: the i-th subarray from A[0] to A[i] interpreted as a binar

2021-01-14 08:50:38 95

原创【LeetCode】684. Redundant Connection 冗余连接（Medium）（JAVA）每日一题

【LeetCode】684. Redundant Connection 冗余连接（Medium）（JAVA）题目地址: https://leetcode.com/problems/redundant-connection/题目描述：In this problem, a tree is an undirected graph that is connected and has no cycles.The given input is a graph that started as a tree wit

2021-01-13 09:08:19 198

原创【LeetCode】1203. Sort Items by Groups Respecting Dependencies 项目管理（Hard）（JAVA）每日一题

【LeetCode】1203. Sort Items by Groups Respecting Dependencies 项目管理（Hard）（JAVA）题目地址: https://leetcode.com/problems/sort-items-by-groups-respecting-dependencies/题目描述：There are n items each belonging to zero or one of m groups where

2021-01-12 08:57:56 178

原创【LeetCode】1202. Smallest String With Swaps 交换字符串中的元素（Medium）（JAVA）每日一题

【LeetCode】1202. Smallest String With Swaps 交换字符串中的元素（Medium）（JAVA）题目地址: https://leetcode.com/problems/smallest-string-with-swaps/题目描述：You are given a string s, and an array of pairs of indices in the string pairs where pairs[i] = [a,

2021-01-11 09:27:54 199

原创【LeetCode】228. Summary Ranges 汇总区间（Easy）（JAVA）每日一题

【LeetCode】228. Summary Ranges 汇总区间（Easy）（JAVA）题目地址: https://leetcode.com/problems/summary-ranges/题目描述：You are given a sorted unique integer array nums.Return the smallest sorted list of ranges that cover all the numbers in the array exactly. That is, e

2021-01-10 10:38:16 89

原创【LeetCode】123. Best Time to Buy and Sell Stock III 买卖股票的最佳时机 III（Hard）（JAVA）每日一题

【LeetCode】123. Best Time to Buy and Sell Stock III 买卖股票的最佳时机 III（Hard）（JAVA）题目地址: https://leetcode.com/problems/best-time-to-buy-and-sell-stock-iii/题目描述：Say you have an array for which the ith element is the price of a given stock on day i.Design an al

2021-01-09 09:01:48 122

原创【LeetCode】189. Rotate Array 旋转数组（Medium）（JAVA）每日一题

【LeetCode】189. Rotate Array 旋转数组（Medium）（JAVA）题目地址: https://leetcode.com/problems/rotate-array/题目描述：Given an array, rotate the array to the right by k steps, where k is non-negative.Follow up:Try to come up as many solutions as you can, the

2021-01-08 09:06:04 80

原创【LeetCode】547. Number of Provinces 省份数量（Medium）（JAVA）每日一题

【LeetCode】547. Number of Provinces 省份数量（Medium）（JAVA）题目地址: https://leetcode.com/problems/number-of-provinces/题目描述：There are n cities. Some of them are connected, while some are not. If city a is connected directly with city b, and city b is connected di

2021-01-07 09:01:24 364 1

原创【LeetCode】399. Evaluate Division 除法求值（Medium）（JAVA）每日一题

【LeetCode】399. Evaluate Division 除法求值（Medium）（JAVA）题目地址: https://leetcode.com/problems/evaluate-division/题目描述：You are given an array of variable pairs equations and an array of real numbers values, where equations[i] = [A_i, B_i] and values[i] represent

2021-01-06 09:48:33 146

原创【LeetCode】830. Positions of Large Groups 较大分组的位置（Easy）（JAVA）每日一题

【LeetCode】830. Positions of Large Groups 较大分组的位置（Easy）（JAVA）题目地址: https://leetcode.com/problems/positions-of-large-groups/题目描述：In a string s of lowercase letters, these letters form consecutive groups of the same character.For example, a string li

2021-01-05 08:55:26 946

原创【LeetCode】509. Fibonacci Number 斐波那契数（Easy）（JAVA）每日一题

【LeetCode】509. Fibonacci Number 斐波那契数（Easy）（JAVA）题目地址: https://leetcode.com/problems/fibonacci-number/题目描述：The Fibonacci numbers, commonly denoted F(n) form a sequence, called the Fibonacci sequence, such that each number is the sum of the two preceding

2021-01-04 08:42:38 124

原创【LeetCode】86. Partition List 分隔链表（Medium）（JAVA）每日一题

【LeetCode】86. Partition List 分隔链表（Medium）（JAVA）题目地址: https://leetcode.com/problems/partition-list/题目描述：Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x.You should preserve the

2021-01-03 10:55:18 84

原创【LeetCode】239. Sliding Window Maximum 滑动窗口最大值（Hard）（JAVA）每日一题

【LeetCode】239. Sliding Window Maximum 滑动窗口最大值（Hard）（JAVA）题目地址: https://leetcode.com/problems/sliding-window-maximum/题目描述：You are given an array of integers nums, there is a sliding window of size k which is moving from the very left of the array to

2021-01-02 09:57:25 96

原创【LeetCode】605. Can Place Flowers 种花问题（Easy）（JAVA）每日一题

【LeetCode】605. Can Place Flowers 种花问题（Easy）（JAVA）题目地址: https://leetcode.com/problems/can-place-flowers/题目描述：You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adjacent plots.Given a

2021-01-01 09:45:48 210

原创【LeetCode】435. Non-overlapping Intervals 无重叠区间（Medium）（JAVA）每日一题

【LeetCode】435. Non-overlapping Intervals 无重叠区间（Medium）（JAVA）题目地址: https://leetcode.com/problems/non-overlapping-intervals/题目描述：Given a collection of intervals, find the minimum number of intervals you need to remove to make the rest of the intervals non

2020-12-31 10:17:56 117

原创【LeetCode】1046. Last Stone Weight 最后一块石头的重量（Easy）（JAVA）每日一题

【LeetCode】1046. Last Stone Weight 最后一块石头的重量（Easy）（JAVA）题目地址: https://leetcode.com/problems/last-stone-weight/题目描述：We have a collection of stones, each stone has a positive integer weight.Each turn, we choose the two heaviest stones and s

2020-12-30 10:06:00 133

原创【LeetCode】390. Elimination Game 消除游戏（Medium）（JAVA）

【LeetCode】390. Elimination Game 消除游戏（Medium）（JAVA）题目地址: https://leetcode.com/problems/elimination-game/题目描述：There is a list of sorted integers from 1 to n. Starting from left to right, remove the first number and every other number afterward until you r

2020-12-29 09:23:13 114

原创【LeetCode】389. Find the Difference 找不同（Easy）（JAVA）

【LeetCode】389. Find the Difference 找不同（Easy）（JAVA）题目地址: https://leetcode-cn.com/problems/find-the-difference/题目描述：You are given two strings s and t.String t is generated by random shuffling string s and then add one more letter at a random position.Re

2020-12-29 09:22:40 99

原创【LeetCode】388. Longest Absolute File Path 文件的最长绝对路径（Medium）（JAVA）

【LeetCode】388. Longest Absolute File Path 文件的最长绝对路径（Medium）（JAVA）题目地址: https://leetcode.com/problems/longest-absolute-file-path/题目描述：Suppose we have a file system that stores both files and directories. An example of one system is represented in the fol

2020-12-29 09:21:39 161

原创【LeetCode】387. First Unique Character in a String 字符串中的第一个唯一字符（Easy）（JAVA）

【LeetCode】387. First Unique Character in a String 字符串中的第一个唯一字符（Easy）（JAVA）题目地址: https://leetcode.com/problems/first-unique-character-in-a-string/题目描述：Given a string, find the first non-repeating character in it and return its index. If it doesn’t exist,

2020-12-29 09:20:57 96

原创【LeetCode】386. Lexicographical Numbers 字典序排数（Medium）（JAVA）

【LeetCode】386. Lexicographical Numbers 字典序排数（Medium）（JAVA）题目地址: https://leetcode.com/problems/lexicographical-numbers/题目描述：Given an integer n, return 1 - n in lexicographical order.For example, given 13, return: [1,10,11,12,13,2,3,4,5,6,7,8,9].Please

2020-12-29 09:20:21 100

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