Topic: "programming-challenges"
in28minutes/java-tutorial-for-beginners
Java Tutorial For Beginners with 500 Code Examples
Size: 1.27 MB - Last synced at: 7 days ago - Pushed at: over 1 year ago - Stars: 1,570 - Forks: 1,468

michelbernardods/programming-challenges
Algorithmic, Data Structures, Frontend and Pentest - Programming challenges and competitions to improve knowledge.
Size: 176 KB - Last synced at: 13 days ago - Pushed at: 11 months ago - Stars: 1,237 - Forks: 152

connor11528/cs-fundamentals
๐ Data structures and algorithms
Language: JavaScript - Size: 543 KB - Last synced at: 14 days ago - Pushed at: 10 months ago - Stars: 1,134 - Forks: 230

ProgrammingHero1/100-plus-python-coding-problems-with-solutions
A list of python problems for beginners and intermediate developers
Size: 153 KB - Last synced at: 11 days ago - Pushed at: almost 2 years ago - Stars: 883 - Forks: 373

spring1843/go-dsa
Go Data Structures and Algorithms is an open source tool for learning and rehearsing data structures and algorithms in Go.
Language: Go - Size: 411 KB - Last synced at: 14 days ago - Pushed at: 14 days ago - Stars: 504 - Forks: 145

ohkimur/the-c-programming-language-2nd-edition-solutions
Solutions to the exercises in the book "The C Programming Language" (2nd edition) by Brian W. Kernighan and Dennis M. Ritchie. This book is also referred to as K&R.
Language: C - Size: 682 KB - Last synced at: 12 months ago - Pushed at: about 1 year ago - Stars: 462 - Forks: 108

mebeim/aoc
๐ My solutions and walkthroughs for Advent of Code and more related stuff.
Language: Python - Size: 22 MB - Last synced at: 13 days ago - Pushed at: 4 months ago - Stars: 408 - Forks: 16

HarryDulaney/intro-to-java-programming
Solutions to Introduction to Java Programming by Y. Daniel Liang. 10th Edition
Language: Java - Size: 60.8 MB - Last synced at: 17 days ago - Pushed at: about 1 year ago - Stars: 328 - Forks: 104

freddiev4/dailyprogrammerchallenges ๐ฆ
Bank of challenges & solutions from r/dailyprogrammer for people learning to program
Language: C - Size: 1.89 MB - Last synced at: 3 days ago - Pushed at: over 3 years ago - Stars: 313 - Forks: 60

DerekCuevas/friend-list
A non-trivial (yet simple) front-end programming challenge.
Language: JavaScript - Size: 731 KB - Last synced at: over 1 year ago - Pushed at: almost 8 years ago - Stars: 288 - Forks: 21

czekster/markov
Materials for book: "Markov Chains for programmers"
Language: C - Size: 21 MB - Last synced at: about 1 year ago - Pushed at: almost 3 years ago - Stars: 273 - Forks: 20

michelbernardods/labs-pentest
Free Labs to Train Your Pentest / CTF Skills
Size: 28.3 KB - Last synced at: 2 months ago - Pushed at: over 2 years ago - Stars: 220 - Forks: 51

TheGeekiestOne/Coursera-Data-Structures-and-Algorithms-Specialization
Master Algorithmic Programming Techniques. Learn algorithms through programming and advance your software engineering or data science career
Language: C++ - Size: 18 MB - Last synced at: over 1 year ago - Pushed at: over 4 years ago - Stars: 145 - Forks: 65

pin3da/notebook-generator
(Auto) generate notebooks from your source code. Useful for ACM-ICPC
Language: JavaScript - Size: 433 KB - Last synced at: 8 months ago - Pushed at: 11 months ago - Stars: 117 - Forks: 54

shanesatterfield/hacker-rank
This is a repository of my solutions to hacker rank problems.
Language: Python - Size: 703 KB - Last synced at: 14 days ago - Pushed at: over 3 years ago - Stars: 114 - Forks: 97

codecrafters-io/frontend
Rebuild complex systems from scratch
Language: TypeScript - Size: 142 MB - Last synced at: 4 days ago - Pushed at: 5 days ago - Stars: 84 - Forks: 18

shiningflash/Competitive-Programming-Resources
Syllabus and some basic tricks for competitive programming beginner and general coding that increases efficiency of your code and gives an impressive look
Language: C++ - Size: 34.1 MB - Last synced at: 12 days ago - Pushed at: over 2 years ago - Stars: 67 - Forks: 26

jusexton/rust-challenges
Programming challenges written in the Rust programming language
Language: Rust - Size: 3.91 MB - Last synced at: about 19 hours ago - Pushed at: about 20 hours ago - Stars: 63 - Forks: 6

keshavsingh4522/Python
this resporatory have ml,ai,nlp,data science etc.python language related material from many websites eg. datacamp,geeksforgeeks,linkedin,youtube,udemy etc. also it include programming challange/competion solutions
Language: Python - Size: 45.2 MB - Last synced at: about 2 years ago - Pushed at: about 2 years ago - Stars: 61 - Forks: 172

meetpatel0963/Online-judge
An Online Judge based on MERN Stack, Spring Boot and Docker.
Language: JavaScript - Size: 7.83 MB - Last synced at: 9 months ago - Pushed at: 9 months ago - Stars: 59 - Forks: 14

nirmalnishant645/LeetCode
LeetCode Problems
Language: Python - Size: 439 KB - Last synced at: 12 days ago - Pushed at: over 2 years ago - Stars: 56 - Forks: 30

witekbobrowski/HackerRank
๐จ๐ปโ๐ป Solutions to hackerrank.com challenges in Swift
Language: Swift - Size: 194 KB - Last synced at: 8 days ago - Pushed at: over 4 years ago - Stars: 48 - Forks: 13

catsmells/pro-g-ramming_challenges
Doing all the pro/g/ramming challenges (4/8chan)
Language: C - Size: 130 KB - Last synced at: over 1 year ago - Pushed at: over 1 year ago - Stars: 40 - Forks: 3

nerdzao/nerdojo
๐ฅ Coding Dojo รฉ uma forma de treinar suas habilidades em desenvolvimento de sistemas. Usamos o formato KATA. Nesse formato vamos apresentar o desafio e apresentar a proposta de soluรงรฃo (sem mostrar o cรณdigo), e reunir as pessoas em equipes. Esse repositรณrio serve como uma central de tudo o que acontece no NCD. Fique por dentro!
Language: Python - Size: 228 KB - Last synced at: 6 months ago - Pushed at: over 5 years ago - Stars: 36 - Forks: 29

thetechgirlgita/100DaysOfCode
#100DaysOfCode - learning c programming by coding daily one program.
Language: C - Size: 128 KB - Last synced at: about 1 month ago - Pushed at: about 1 month ago - Stars: 34 - Forks: 10

pierpaolo28/Companies-Data-Science-Challenges
Collection of Data Science Challenges designed by different companies during Hackatons, Events, etc...
Language: Jupyter Notebook - Size: 25.1 MB - Last synced at: about 2 years ago - Pushed at: about 4 years ago - Stars: 25 - Forks: 15

codingmoney/javascript-coding-interview-questions
CodingMoney.com
Language: JavaScript - Size: 9.77 KB - Last synced at: about 1 year ago - Pushed at: over 2 years ago - Stars: 22 - Forks: 11

bornlogic/frontend-interview_challenge
Size: 21.5 KB - Last synced at: about 2 years ago - Pushed at: over 2 years ago - Stars: 21 - Forks: 6

triatebr/aprenda-python
Aprendizado, dicas e projetos sobre Python
Language: Jupyter Notebook - Size: 71.3 MB - Last synced at: about 2 years ago - Pushed at: over 4 years ago - Stars: 21 - Forks: 6

boostcampwm-2021/web04-canyoufixme
:construction: :bug: ๊ฐ๋ฐ์๋ฅผ ์ํ ๋๋ฒ๊น ํ๋ จ ํ๋ซํผ :hammer_and_pick: :construction:
Language: TypeScript - Size: 1.75 MB - Last synced at: about 1 month ago - Pushed at: almost 3 years ago - Stars: 19 - Forks: 7

FreeCX/programming-challenges
Pro/g/ramming Challenges v1.3 in rust
Language: Rust - Size: 95.7 KB - Last synced at: 7 days ago - Pushed at: almost 3 years ago - Stars: 19 - Forks: 0

junhoyeo/WriteUps
๐ดโโ ๏ธ ๊ฐ์ข ๋ํ ๋ฌธ์ ํ์ด / WriteUp files from CTF(Capture The Flag) contests & Wargames, Programming Challenges
Language: Python - Size: 215 MB - Last synced at: 12 months ago - Pushed at: over 5 years ago - Stars: 18 - Forks: 2

jdevfullstack/java-coding-problems
your ticket to the dev world
Language: Java - Size: 434 KB - Last synced at: 9 months ago - Pushed at: 9 months ago - Stars: 17 - Forks: 3

JoeyTawadrous/Algorithm-Implementations
Lots of algorithm's & their implementations that have been compiled from a variety of locations.
Language: Java - Size: 16.6 KB - Last synced at: about 1 year ago - Pushed at: over 7 years ago - Stars: 17 - Forks: 6

erikw/advent-of-code-solutions
My solutions to puzzles at https://adventofcode.com/
Language: Ruby - Size: 41 MB - Last synced at: about 3 hours ago - Pushed at: about 4 hours ago - Stars: 16 - Forks: 0

Ana06/programming-challenges
Solutions for several programming and capture the flag (CTF) competitions. ๐
Language: Python - Size: 44.9 KB - Last synced at: 6 days ago - Pushed at: over 2 years ago - Stars: 16 - Forks: 0

dsafio/dsafio ๐ฆ
Practicing tool for coders ๐ค
Language: JavaScript - Size: 151 KB - Last synced at: about 2 years ago - Pushed at: over 4 years ago - Stars: 15 - Forks: 5

CharlesIC/Codility
Codility solutions in C#
Language: C# - Size: 273 KB - Last synced at: 5 months ago - Pushed at: over 9 years ago - Stars: 15 - Forks: 54

rdtsc/ringzer0-ctf-solutions
My solutions to RingZer0 CTF programming challenges
Language: JavaScript - Size: 6.11 MB - Last synced at: almost 2 years ago - Pushed at: over 8 years ago - Stars: 14 - Forks: 2

rvprg/pc
Solutions to Programming Challenges. (Literate Programs.)
Language: Java - Size: 38.2 MB - Last synced at: 6 days ago - Pushed at: 6 days ago - Stars: 12 - Forks: 5

rdtsc/codeeval-problem-statements
CodeEval (defunct) problem statement archive
Size: 8.29 MB - Last synced at: almost 2 years ago - Pushed at: almost 4 years ago - Stars: 12 - Forks: 19

azminewasi/Sololearn-Course-Projects
All my solo learn course projects and certificates
Language: Python - Size: 1.37 MB - Last synced at: almost 2 years ago - Pushed at: almost 2 years ago - Stars: 11 - Forks: 5

vimaltiwari2612/Interview-Preparation
Competitive & Interview Coding questions and solutions.
Language: Apex - Size: 77.4 MB - Last synced at: about 2 months ago - Pushed at: over 3 years ago - Stars: 11 - Forks: 6

emhayki/Project-Euler
Solutions to various Project Euler problems implemented in different programming languages.
Language: MATLAB - Size: 162 KB - Last synced at: 2 days ago - Pushed at: 3 days ago - Stars: 10 - Forks: 1

ChaseDurand/Array-Subsets
Solution implementation for HackerRank's Array-Subsets problem.
Language: C++ - Size: 1.18 MB - Last synced at: 8 months ago - Pushed at: almost 3 years ago - Stars: 10 - Forks: 2

migafgarcia/programming-challenges
My solutions to various programming challenges.
Language: C++ - Size: 1.49 MB - Last synced at: 3 months ago - Pushed at: 3 months ago - Stars: 9 - Forks: 3

ravi-kumar7/Power-Programmer
The solution to some well-known programming challenges.
Language: Python - Size: 94.7 KB - Last synced at: almost 2 years ago - Pushed at: about 2 years ago - Stars: 9 - Forks: 0

RahulSinghRawatDev/DataStructure
DataStructures with Java and Competitive Coding Programs from HackerEarth.
Language: Java - Size: 54.7 KB - Last synced at: about 1 year ago - Pushed at: over 5 years ago - Stars: 9 - Forks: 4

cesarleaz/hackjs
Mejorar tus habilidades de programaciรณn en JavaScript a travรฉs de una variedad de ejercicios prรกcticos y desafiantes.
Language: Astro - Size: 396 KB - Last synced at: 8 months ago - Pushed at: 9 months ago - Stars: 8 - Forks: 1

ChanMeng666/juejin-algorithm-practice
ใStar us and watch this project grow! ๐ฑโญ๏ธใCollection of algorithm problems and solutions from ByteDance MarsCode Youth Training Camp (Winter 2024-2025). This repository contains coding challenges and their implementations used in the camp's entrance assessment.
Language: Python - Size: 4.74 MB - Last synced at: 13 days ago - Pushed at: 2 months ago - Stars: 7 - Forks: 1

harismuneer/How-to-Win-Coding-Competitions
๐จ๐ผโ๐ป Intro to competitive programming, covering key algorithms, strategies, and problem-solving skills essential for success in coding competitions and technical interviews.
Size: 6.99 MB - Last synced at: about 2 months ago - Pushed at: 3 months ago - Stars: 7 - Forks: 1

theoludwig/programming-challenges
Programming exercises and challenges to improve your algorithmic logic.
Language: C - Size: 2.31 MB - Last synced at: 3 days ago - Pushed at: 5 months ago - Stars: 7 - Forks: 1

prasadhonrao/show-me-the-code
One stop forever free shop for developers to learn programming with Java, Python and C# and have fun!
Language: Java - Size: 46.9 KB - Last synced at: 16 days ago - Pushed at: over 2 years ago - Stars: 7 - Forks: 2

ddVital/problem-solving
A list of python/c++ Problems with solutions for beginners and intermediate developers.
Language: C - Size: 6.84 KB - Last synced at: almost 2 years ago - Pushed at: almost 3 years ago - Stars: 7 - Forks: 5

geekayush/30daysofcode
Try a new challenge every day for 30 days. By the end of the month, you'll go from newbie to expert.
Language: Java - Size: 43 KB - Last synced at: about 2 years ago - Pushed at: almost 6 years ago - Stars: 7 - Forks: 1

hamidb80/problem-solving
I put my solutions here
Language: Nim - Size: 3.4 MB - Last synced at: 28 days ago - Pushed at: 29 days ago - Stars: 6 - Forks: 0

ctu-mrs/leader_follower_task
Seminar task used during the MRS Summer school 2020. The goal is to develop a controller for a follower drone in order to keep up with an evading leader drone.
Language: C++ - Size: 157 KB - Last synced at: 6 months ago - Pushed at: 6 months ago - Stars: 6 - Forks: 2

bkpecho/CodeWars
Welcome to my CodeWars coding challenges repository! Here, you will find solutions to various coding challenges that I have completed on CodeWars.
Language: JavaScript - Size: 484 KB - Last synced at: 1 day ago - Pushed at: about 1 year ago - Stars: 6 - Forks: 0

b3nNn/bottle-royale
Bottle Royale - A Battle Royale Arena for JS Programming Challenges
Language: JavaScript - Size: 2.37 MB - Last synced at: about 2 months ago - Pushed at: over 2 years ago - Stars: 6 - Forks: 1

kupolak/codewars
Solved codewars problems.
Language: Ruby - Size: 546 KB - Last synced at: 17 days ago - Pushed at: almost 3 years ago - Stars: 6 - Forks: 1

theprogrammedwords/Algorithm-Solutions-Java
This repository is going to be based on some coding interview questions and competitive programming challenges. Optimal Approach based solutions will be uploaded.
Language: Java - Size: 295 KB - Last synced at: over 1 year ago - Pushed at: almost 4 years ago - Stars: 6 - Forks: 3

potigol/MaratonaSBC ๐ฆ
Soluรงรฃo das questรตes da Maratona de Programaรงรฃo da SBC usando a linguagem Potigol
Size: 46.9 KB - Last synced at: about 1 year ago - Pushed at: about 6 years ago - Stars: 6 - Forks: 1

alirezaomidi/acm
ACM problems solutions
Language: C++ - Size: 248 KB - Last synced at: 2 days ago - Pushed at: over 7 years ago - Stars: 6 - Forks: 4

hb20007/coding-challenge-solutions
My solutions to programming puzzles (Leetcode, Advent of Code, ...)
Language: JavaScript - Size: 535 KB - Last synced at: 2 months ago - Pushed at: 2 months ago - Stars: 5 - Forks: 1

nragland37/aoc
:christmas_tree: Advent of Code | An annual advent calendar of small programming puzzles
Language: Python - Size: 419 KB - Last synced at: 8 days ago - Pushed at: 7 months ago - Stars: 5 - Forks: 1

jesushilarioh/C-Plus-Plus
C++ practice and exercices.
Language: C++ - Size: 9.69 MB - Last synced at: 9 months ago - Pushed at: 9 months ago - Stars: 5 - Forks: 5

MooudMohammady/ACM-Dashboard
A simple Electron.js application for ACM | programing language challenge
Language: TypeScript - Size: 193 KB - Last synced at: 18 days ago - Pushed at: about 1 year ago - Stars: 5 - Forks: 1

SMath0510/Programming-Club-2023
Contains the codes, slides, problems and solutions related to the Programming Camps
Language: C++ - Size: 22.5 MB - Last synced at: about 1 year ago - Pushed at: about 1 year ago - Stars: 5 - Forks: 0

Adrrei/Kattis-Challenges
Java/C# solutions for various programming challenges on Kattis.
Language: Java - Size: 111 KB - Last synced at: 16 days ago - Pushed at: about 3 years ago - Stars: 5 - Forks: 2

TSG405/Python_HackerranK
Contains Solved HackerranK problems on Python (includes PROBLEM SOLVING APPROACHES)
Language: Python - Size: 157 KB - Last synced at: 8 days ago - Pushed at: about 4 years ago - Stars: 5 - Forks: 2

thelittlewonder/crowdcode
Grand Prize Winning Hack for TopCoder Humblefool Hackathon
Language: Java - Size: 21.4 MB - Last synced at: 5 months ago - Pushed at: over 6 years ago - Stars: 5 - Forks: 0

TVATDCI/Algorithm-challenge
A very good place to practice algorithms is LeetCode - this exercise contains practice challenges similar to the problems found on LeetCode.
Language: JavaScript - Size: 3.69 MB - Last synced at: 12 days ago - Pushed at: 3 months ago - Stars: 4 - Forks: 1

orca-io/orca-challenges
The Orca Programming Challenges
Size: 42 KB - Last synced at: 5 months ago - Pushed at: 5 months ago - Stars: 4 - Forks: 1

thedvlprguy/Aurora
Documentation of Aurora
Language: Python - Size: 16.6 KB - Last synced at: 12 days ago - Pushed at: about 1 year ago - Stars: 4 - Forks: 0

security-softwares/crispy-bash-utilities
Awesome bash utilities
Language: Shell - Size: 97.7 KB - Last synced at: about 2 years ago - Pushed at: over 2 years ago - Stars: 4 - Forks: 0

arasgungore/CodingCompetition Fork of defia-soft/CodingCompetition
My C++ solution for the Defia-Soft coding competition.
Language: C# - Size: 8.79 KB - Last synced at: about 2 years ago - Pushed at: about 3 years ago - Stars: 4 - Forks: 0

oguzkeremyildiz/ProgrammingChallenges
Codes For Training
Language: Java - Size: 31.6 MB - Last synced at: over 1 year ago - Pushed at: about 3 years ago - Stars: 4 - Forks: 1

AnhellO/ProgrammingChallenges
Algorithms, attempts and solutions to some online judges and programming challenges platforms around the web.
Language: C++ - Size: 10.2 MB - Last synced at: over 1 year ago - Pushed at: over 4 years ago - Stars: 4 - Forks: 2

dostonhamrakulov/Python-challenging-programming-exercises
Python programming exercises
Language: Python - Size: 3.56 MB - Last synced at: almost 2 years ago - Pushed at: about 6 years ago - Stars: 4 - Forks: 1

MJVL/Programming-Challenges
My solutions for r/dailyprogrammer and ASCL challenges
Language: Java - Size: 80.1 KB - Last synced at: about 2 months ago - Pushed at: over 6 years ago - Stars: 4 - Forks: 0

andreassjoberg/interview-tests
Repository for interviewing / programming tests
Language: C# - Size: 7.81 KB - Last synced at: about 1 year ago - Pushed at: over 7 years ago - Stars: 4 - Forks: 1

chen0040/java-leetcode
My daily LeetCode solutions
Language: Java - Size: 841 KB - Last synced at: 18 days ago - Pushed at: over 7 years ago - Stars: 4 - Forks: 4

erkamuzuncayir/solutions-of-introduction-to-computing-systems
This repository contains my solutions for Introduction to Computing Systems - From Bits & Gates to C - C++ & Beyond by Yale Patt and Sanjay Patel
Size: 6.04 MB - Last synced at: 26 days ago - Pushed at: 26 days ago - Stars: 3 - Forks: 2

sagarnikam123/learnNPractice
learn by coding
Language: Python - Size: 33.9 MB - Last synced at: 7 months ago - Pushed at: 7 months ago - Stars: 3 - Forks: 1

jeamon/goalgo
This repository contains some coding challenges tasks done completely into golang. Feel free to learn from them.
Language: Go - Size: 83 KB - Last synced at: 12 days ago - Pushed at: 8 months ago - Stars: 3 - Forks: 1

mfirhas/ProgrammingChallenges
Some Programming Challenges Solved online.
Language: C# - Size: 716 KB - Last synced at: 7 days ago - Pushed at: 8 months ago - Stars: 3 - Forks: 2

nspalo/programming-challenge
Some Interesting Programming Problems, Challenges and Solutions
Language: PHP - Size: 102 KB - Last synced at: 12 months ago - Pushed at: over 1 year ago - Stars: 3 - Forks: 2

pravinargade18/CP-world
A well organized Competitive Programming ๐งโ๐ป repository, including problems from various platforms....๐
Language: C++ - Size: 500 KB - Last synced at: about 1 year ago - Pushed at: over 1 year ago - Stars: 3 - Forks: 0

sagelga/prepro60
Python3 coding lesson for new Python users, crafted for new PSIT students.
Size: 24.4 MB - Last synced at: about 1 year ago - Pushed at: about 2 years ago - Stars: 3 - Forks: 2

friol/oppd
The race (against myself) to write one program per day in November 2022
Language: C++ - Size: 909 KB - Last synced at: over 1 year ago - Pushed at: over 2 years ago - Stars: 3 - Forks: 0

smackem/jobotwar
A RobotWar clone using JavaFX, REST and Blazor WebAssembly
Language: Java - Size: 5.17 MB - Last synced at: about 2 years ago - Pushed at: over 2 years ago - Stars: 3 - Forks: 1

Yolgie/codingame
Collecting my CodinGame Solutions
Language: Kotlin - Size: 68.4 KB - Last synced at: almost 2 years ago - Pushed at: over 3 years ago - Stars: 3 - Forks: 1

KunalRRathod/Java_Programs
This is related to college level java programs and assignments.
Language: Java - Size: 44.9 KB - Last synced at: 23 days ago - Pushed at: over 4 years ago - Stars: 3 - Forks: 1

alps-jbnu/litmus-site
Litmus Online Judge (Site)
Language: Python - Size: 9.13 MB - Last synced at: about 2 years ago - Pushed at: over 4 years ago - Stars: 3 - Forks: 5

LuisFernando1407/programming_challenges
Programming challenges repository
Language: Kotlin - Size: 9.77 KB - Last synced at: over 1 year ago - Pushed at: almost 5 years ago - Stars: 3 - Forks: 0

woojiahao/aoc-19
Language: Kotlin - Size: 38.1 KB - Last synced at: 2 months ago - Pushed at: about 5 years ago - Stars: 3 - Forks: 0

vincevargadev/algorithms_dart
Test-Driven Dart Algorithms. Coding interview questions, algorithms, problems solved using Dart.
Language: Dart - Size: 20.5 KB - Last synced at: 13 days ago - Pushed at: over 5 years ago - Stars: 3 - Forks: 1

rdtsc/root-me-ctf-solutions
My solutions to Root Me CTF programming challenges
Language: JavaScript - Size: 60.5 KB - Last synced at: almost 2 years ago - Pushed at: almost 6 years ago - Stars: 3 - Forks: 0

carmocca/UVA
UVA programming challenges
Language: Python - Size: 5.01 MB - Last synced at: 19 days ago - Pushed at: over 6 years ago - Stars: 3 - Forks: 3

marksurnin/algorithmic-problem-solving
Solving programming challenges, one at a time.
Language: Java - Size: 470 KB - Last synced at: 5 months ago - Pushed at: almost 8 years ago - Stars: 3 - Forks: 1
