## Summary of common data structures and algorithms (including examples and complete codes)

1, Bit operation ● ^ can be understood as non carry addition ● a^a=0 ● a^0=a Topic 1 In a group of numbers, only one number appears odd, and the other numbers appear even. Find the number whose occurrence is odd. public static void printOddTimesNum1(int[] arr) { int eor = 0; for (int i : arr) { eor ^= i; } System.out ...

Posted by always_confused on Sat, 23 Apr 2022 05:36:21 +0300

## Leetcode question brushing diary 2021.2.6 (supplementary)

Leetcode writing diary 2021.2.6 (supplementary) Title Link: https://leetcode-cn.com/problems/yong-liang-ge-zhan-shi-xian-dui-lie-lcof/solution/mian-shi-ti-09-yong-liang-ge-zhan-shi-xian-dui-l-3/ Problem Description: Queue with two stacks Answer 1: Using Stack code: import java.util.Stack; class CQueue { Stack<Integer> appendSt ...

Posted by DaveMate on Thu, 21 Apr 2022 04:07:23 +0300

## Solution to the 227th weekly game of LeetCode

Solution to the 227th weekly game of LeetCode Check whether the array is sorted and rotated Original question link https://leetcode-cn.com/problems/check-if-array-is-sorted-and-rotated/ Problem solving ideas Just test directly, because the data range of the array is very small O ( ...

Posted by christo16 on Wed, 20 Apr 2022 22:46:38 +0300

## [code Capriccio] column of binary tree and binary search tree (java version with comments)

preface For the supplement of the following code, see the following link: Binary tree theory and code in code Capriccio This paper mainly studies according to the learning route of the link, reading its ideas and self cognition, and adding code comments Convenient for self-study, interested students can also collect and pay attention The ...

Posted by XPertMailer on Wed, 20 Apr 2022 08:16:34 +0300

## Single linked list algorithm design (including large factory interview questions)

1. Introduction to single linked list and memory layout The linked list is an ordered list, but it is stored in memory as follows: Summary: 1) Linked list is stored in the form of nodes, which is chain storage 2) Each node contains data field and next field: point to the next node 3) As shown in the figure: it is found that each node of t ...

Posted by cooler75 on Tue, 19 Apr 2022 13:06:47 +0300

## LeetCode_ Array_ 221. Maximum square [dynamic programming, simulation] [Java] [medium]

catalogue 1, Title Description English description Chinese description Examples and descriptions 2, Problem solving ideas 3, AC code Java (2D dp) 4, Problem solving process First fight Second stroke   1, Title Description English description Given an m x n binary matrix filled with 0's and 1's, find the largest square contai ...

Posted by MarkR on Tue, 19 Apr 2022 08:33:52 +0300

## Leetcode (week 228)

5676. Minimum operands for generating alternating binary strings (question 1) subject Give you a string s consisting only of the characters' 0 'and' 1 '. In one step, you can change any '0' to '1', or '1' to '0'. Alternating string is defined as: if two adjacent characters are not equal in the string, the string is an alternating string. ...

Posted by farsighted on Tue, 19 Apr 2022 01:43:33 +0300

## [LeetCode] 1032. Stream of Characters

Implement the StreamChecker class as follows: StreamChecker(words): Constructor, init the data structure with the given words. query(letter): returns true if and only if for some k >= 1, the last k characters queried (in order from oldest to newest, including this letter just queried) spell one of the words in the given list. Example: Str ...

Posted by Chinese on Mon, 18 Apr 2022 19:56:52 +0300

## Force buckle 566 Remodeling matrix - C language implementation - simple questions

subject Portal In MATLAB, there is a very useful function reshape, which can reshape a matrix into another new matrix of different sizes, but retain its original data. A matrix represented by a two-dimensional array and two positive integers r and c are given to represent the number of rows and columns of the matrix to be reconstructed res ...

Posted by dipenmistry on Mon, 18 Apr 2022 15:25:30 +0300

## leetcode_ Dynamic programming_ python

General points: Clarify the meaning of dp. During initialization, pay attention to limiting the input. After initialization, pay attention to the iteration after initialization! Start after initialization! Start after initialization! Step: define the meaning and recurrence formula, and create dp; Initialize dp; Iteration dp Difference between ...

Posted by Drewser33 on Mon, 18 Apr 2022 07:39:28 +0300