---
tags: Code Mely
title: CodeMely slide 1
author: Vo Hoang Anh - SPyofgame
license: Private Use
---
<style>
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$$
\begin{array}{c}
\texttt{C++ Competitive Programming Course}\\
\textbf{Introduction to Competitive Programming}\\
\end{array}
$$
<table style="font-size: 27px;">
<tr>
<td class="green"><strong>Lecturer:</strong></td>
<td class="orange">Võ Hoàng Anh</td>
<td class="green"><strong>Course:</strong></td>
<td class="orange">CODEMELY</td>
</tr>
<tr>
<td class="green"><strong>Nickname:</strong></td>
<td class="orange">@SPyofgame</td>
<td class="green"><strong>Semester:</strong></td>
<td class="orange">2024-2025</td>
</tr>
<tr>
<td class="green"><strong>Assistant:</strong></td>
<td class="orange"></td>
<td class="green"><strong>Session:</strong></td>
<td class="orange">#1</td>
</tr>
</table>
<table style="font-size: 20px;">
<tr>
<td colspan="4" class="red"><strong>Course Info:</strong> </td>
<td> <a href="https://hackmd.io/@codemely/index">https://hackmd.io/@codemely/index</a></td>
</tr>
<tr>
<td colspan="4" class="red"><strong>Read as note:</strong> </td>
<td> <a href="https://hackmd.io/@codemely/introduction">https://hackmd.io/@codemely/introduction</a></td>
</tr>
<tr>
<td colspan="4" class="red"><strong>Read as slide:</strong> </td>
<td> <a href="https://hackmd.io/@codemely/slide1">https://hackmd.io/@codemely/slide1</a></td>
</tr>
<tr>
<td colspan="4" class="red"><strong>Hashed link:</strong> </td>
<td> <a href="https://hackmd.io/ICik8f6FTmWz5qBxSihNlg?view#/">https://hackmd.io/ICik8f6FTmWz5qBxSihNlg?view#/</a></td>
</tr>
</table>
---
## I. Lecturer First Meeting
<div style="display: flex; justify-content: center;">
<figure style="margin-right: 50px; text-align: center;">
<img src="https://hackmd.io/_uploads/Hk6FzTtBR.png" alt="" style="height:100px; max-width:100px">
<figcaption>Lecturer SPyogame</figcaption>
</figure>
<figure style="margin-right: 50px; text-align: center;">
<img src="https://hackmd.io/_uploads/rylZ7VELC.png" alt="" style="height:100px; max-width:100px">
<figcaption>CodeMely Members</figcaption>
</figure>
</div>
---
### I.1 - Who is SPyofgame ?
<div style="display: flex; justify-content: center;">
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/HJrlXUZL0.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2016</figcaption>
</figure>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/H1bYDaYHR.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2017</figcaption>
</figure>
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/r1kkUTtr0.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2018</figcaption>
</figure>
</div>
<div style="display: flex; justify-content: center;">
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/S1sELpKHC.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2019</figcaption>
</figure>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/ry4P_aKSR.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2020</figcaption>
</figure>
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/B1IfSTtHC.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2021</figcaption>
</figure>
</div>
<div style="display: flex; justify-content: center;">
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/B1sCL6tHA.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2022</figcaption>
</figure>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/BJPjEaKSA.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2023</figcaption>
</figure>
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/HJ9uLpKrC.png" alt="" style="height:100px; max-width:100px">
<figcaption>Year 2024</figcaption>
</figure>
</div>
----
### I.1 - Who is SPyofgame ?
#### I.1-a) Year 2016 - Tan Loi H.S., Grade 6
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/ByAO_pFH0.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
My journey started when I was in Grade 6.
I enjoyed IT but I didn't know English.
I was able to type 80 wpm at that time.
----
### I.1 - Who is SPyofgame ?
#### I.1-b) Year 2017 - Tan Loi H.S., Grade 7
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/H1bYDaYHR.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I started to use `Scratch` in Grade 7.
I learned English and coding on my own.
My first released game had 200 plays per week.
----
### I.1 - Who is SPyofgame ?
#### I.1-c) Year 2018 - Tan Loi H.S., Grade 8
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/r1kkUTtr0.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I started to learn `Pascal` in grade 8.
I was one of four selected for the OI Contest.
I failed the provincial round miserably !
----
### I.1 - Who is SPyofgame ?
#### I.1-d) Year 2019 - Tan Loi H.S., Grade 9
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/S1sELpKHC.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I started to learn `C++` in Grade 9.
I still tried my best to excel in the provincial contest.
I failed to advance to the next round by `0.01` points.
----
### I.1 - Who is SPyofgame ?
#### I.1-e) Year 2020 - Nguyen Du HSGS, Grade 10
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/B1IfSTtHC.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I got into HSGS with a `0.001` margin
I failed the provincial contest miserably.
I started learning algorithms on Codeforces.
----
### I.1 - Who is SPyofgame ?
#### I.1-f) Year 2021 - Nguyen Du HSGS, Grade 11
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/ry4P_aKSR.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I skipped classes just to learn coding.
I was on the FFA chess leaderboard on `chess.com`.
I got into the National Team but failed VOI miserably.
----
### I.1 - Who is SPyofgame ?
#### I.1-g) Year 2022 - Nguyen Du HSGS, Grade 12
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/B1sCL6tHA.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I grinded my health for coding with sleepless nights.
I joined `300+` contests with `3000+` solved problems.
I failed VOI but got a consolation prize as a top ranker.
I earned my first paycheck as a Codeforces setter.
----
### I.1 - Who is SPyofgame ?
#### I.1-h) Year 2023 - HCMUS, 1st Year Student
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/BJPjEaKSA.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I created `200+` editorials and `20+` problems.
I won an Amateur National OI championship.
I won third prize for National ICPC.
----
### I.1 - Who is SPyofgame ?
#### I.1-i) Year 2024 - HCMUS, 2nd Year Student
<center>
<figure style="margin-right: 100px; text-align: center;">
<img src="https://hackmd.io/_uploads/HJ9uLpKrC.png" alt="" style="height: 250px;height:300px;">
</figure>
</center>
I taught students for free for `69` 3-hour sessions.
My first fivethree students were admitted to HSGS.
I created my first `C++` game of `16000` lines of code.
---
### I.2 - Introduce yourself
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/rylZ7VELC.png" alt="" style="height: 250px;height:300px;">
<figcaption>CodeMely Members</figcaption>
</figure>
----
### I.2 - Introduce yourself
#### I.2-a) What is your target ?
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/HJQFNRtBA.png" alt="" style="height: 250px;height:300px;">
<figcaption>
"Aim to write not just code, but the future itself"
</figcaption>
</figure>
----
### I.2 - Introduce yourself
#### I.2-b) Why do you want to learn ?
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/ryGMHRKBC.png" alt="" style="height: 250px;height:300px;">
<figcaption>
"Knowledge is power, with time as currency"
</figcaption>
</figure>
----
### I.2 - Introduce yourself
#### I.2-c) How do you self-learn ?
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/S1C64CYrC.png" alt="" style="height: 250px;height:300px;">
<figcaption>"Shape yourself, reshape the whole world"</figcaption>
</figure>
---
### I.3 - What do you gains from coding ?
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/BJUAD0tH0.png" alt="" style="height: 250px;height:300px;">
<figcaption>Coding is real-life magic</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-a) Time Control
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/HyeFFCFHC.png" alt="" style="height: 250px;height:300px;">
<figcaption>You have flexible time schedule</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-b) Free Money++
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/SJ40qRFS0.png" alt="" style="height: 250px;height:300px;">
<figcaption>Better career, easier money gain</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-c) Human Manipulation
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/S1yMoCKSC.png" alt="" style="height: 250px;height:300px;">
<figcaption>You have better people, know more opportunities</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-d) X-Ray Eyes
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/HJWFhCtSA.png" alt="" style="height: 250px;height:300px;">
<figcaption>You can decise better and avoid risks</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-e) Super Abilities
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/r1eN6CYrC.png" alt="" style="height: 250px;height:300px;">
<figcaption>Problem Solving Skills and Analytical Thimking</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-f) Dominace Power
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/rJEqaCYrR.png" alt="" style="height: 250px;height:300px;">
<figcaption>Your words are strong, you have influence</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-g) Quick Teleportation
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/S17N0RtB0.png" alt="" style="height: 250px;height:300px;">
<figcaption>You are funded to travel many places</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-h) Build Harem
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/HJfs0AYrR.png" alt="" style="height: 250px;height:300px;">
<figcaption>You have collaborations from everywhere</figcaption>
</figure>
----
### I.3 - What do you gains from coding ?
#### I.3-i) Infinity Stones
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/SJg0CRtSR.png" alt="" style="height: 250px;height:300px;">
<figcaption>The learning resources are scattered everywhere</figcaption>
</figure>
---
### I.4 - Coding Philosophy
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/BkIVF0FHR.png" alt="" style="height: 250px;height:300px;">
<figcaption>50% of your success based on your first step</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-a) Take Damn Steps
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/S1Sy90trA.png" alt="" style="height: 250px;height:300px;">
<figcaption>Take your damn first steps, yes, literally !</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-b) Your Inevitable Sacrifice
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/BJzCdAtH0.png" alt="" style="height: 250px;height:300px;">
<figcaption>Get out of your safe zone: gaming/tiktok/facebook</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-c) Stop Wasting Yourtime
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/SJAZuRtrR.png" alt="" style="height: 250px;height:300px;">
<figcaption>Focus on what you need !</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-d) Code everywhere anytime
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/B19j1y9SC.png" alt="" style="height: 250px;height:300px;">
<figcaption>If you can learn something good, learn !</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-e) Stop Excuse Yourself
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/S1W0yy9H0.png" alt="" style="height: 250px;height:300px;">
<figcaption>If you want something, try your best to do it !</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-f) Talk Less, Code !
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/r1Oqx1qSC.png" alt="" style="height: 250px;height:300px;">
<figcaption>No one cares how you tried, but what you succeeded</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-g) Dont f\*ckin' cheat !
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/By_WWJcSR.png" alt="" style="height: 250px;height:300px;">
<figcaption>Cheating often backfires when you least expect it.</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-h) Nothing to lose
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/Hyn4NJcrA.png" alt="" style="height: 250px;height:300px;">
<figcaption>Experts fails more than you ever try</figcaption>
</figure>
----
### I.4 - Coding Philosophy
#### I.4-i) Rise Above All
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/rJR6rJ9S0.png" alt="" style="height: 250px;height:300px;">
<figcaption>Master your skills, only helpless beg for luck</figcaption>
</figure>
---
### I.5 - Where to begin ?
----
### I.5 - Where to begin ?
#### I.5-a) Online Compiler
<center>
<table class="example-table">
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/Bk2bwJcHC.png" alt="">
<figcaption>Ideone</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/S13fOy5H0.png" alt="">
<figcaption>OneCompiler</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BkKMv1qrA.png" alt="">
<figcaption>OnlineGDB</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/Sy5FPwcS0.png" alt="">
<figcaption>Replit</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SkTaHPqSA.png" alt="">
<figcaption>CodeInterview</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rJuwoJqHC.png" alt="">
<figcaption>Codeforces</figcaption>
</figure>
</td>
</tr>
<tr>
</tr>
</table>
</center>
----
### I.5 - Where to begin ?
#### I.5-b) Offline Compiler
<center>
<table class="example-table">
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SySVo1cHA.png" alt="">
<figcaption>VScode</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rkPpdJ5BC.png" alt="">
<figcaption>MSVC</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/ryvhd19rC.png" alt="">
<figcaption>Codeblock</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/HJmJK15BC.png" alt="">
<figcaption>DevC++</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BkMEYk9rR.png" alt="">
<figcaption>SublimeText</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BJIPtJ5HC.png" alt="">
<figcaption>Notepad++</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SyVosPqrC.png" alt="">
<figcaption>Nano</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rkMC5y5rC.png" alt="">
<figcaption>Vim</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/H1unFkqSA.png" alt="">
<figcaption>Notepad</figcaption>
</figure>
</td>
</tr>
</table>
</center>
----
### I.5 - Where to begin ?
#### I.5-c) Online Judge
<center>
<table class="example-table">
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SJQcnJ9HC.png" alt="">
<figcaption>Atcoder</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SypoTk5H0.png" alt="">
<figcaption>HackerRank</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SkExny9BA.png" alt="">
<figcaption>Leetcode</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rJuwoJqHC.png" alt="">
<figcaption>Codeforces</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BkZYsy5B0.png" alt="">
<figcaption>SPOJ</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rJOAi1cSA.png" alt="">
<figcaption>CSES</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rJhj319rR.png" alt="">
<figcaption>OJUZ</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/r1V9TycrR.png" alt="">
<figcaption>USACO</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SJTXn19BC.png" alt="">
<figcaption>DMOJ</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BJ_MnJ5S0.png" alt="">
<figcaption>VNOJ</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rkAAakcHA.png" alt="">
<figcaption>COCI</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/Bk9Uny9rR.png" alt="">
<figcaption>LQDOJ</figcaption>
</figure>
</td>
</tr>
</table>
</center>
----
### I.5 - Where to begin ?
#### I.5-d) Online Resources
<center>
<table class="example-table">
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/r1HN6yqBC.png" alt="">
<figcaption>cp-algorithms</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/r1V9TycrR.png" alt="">
<figcaption>USACO</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rJuwoJqHC.png" alt="">
<figcaption>Codeforces</figcaption>
</figure>
</td>
</tr>
</table>
</center>
----
### I.5 - Where to begin ?
#### I.5-e) Team Note
<center>
<table class="example-table">
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/ByRIrvqrC.png" alt="">
<figcaption>Notion</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SJcedD5BA.png" alt="">
<figcaption>Confluence</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rkDEHw5SA.png" alt="">
<figcaption>HackMD</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SkwQLPqrR.png" alt="">
<figcaption>Slack</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SysZKP5HC.png" alt="">
<figcaption>Telegram</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/HJxU8v9SR.png" alt="">
<figcaption>Discord</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/HJOwLDcBR.png" alt="">
<figcaption>G-Drive</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/HkgqIPqrA.png" alt="">
<figcaption>G-Docs</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BJsNdDcBC.png" alt="">
<figcaption>G-Keep</figcaption>
</figure>
</td>
</tr>
</table>
</center>
----
### I.5 - Where to begin ?
#### I.5-f) Team Collaborating
<center>
<table class="example-table">
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/Sy5FPwcS0.png" alt="">
<figcaption>Notion</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SkTaHPqSA.png" alt="">
<figcaption>CodeInterview</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SkGRHv9BC.png" alt="">
<figcaption>Codeshare</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rJ2CtD9BC.png" alt="">
<figcaption>Miro</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/H10rcP9S0.png" alt="">
<figcaption>LucidChart</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rJxXQDP5HA.png" alt="">
<figcaption>Excalidraw</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/S1T29w5HA.png" alt="">
<figcaption>Duckly</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/H1cVsDcSC.png" alt="">
<figcaption>Codeanywhere</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BkTswDcHR.png" alt="">
<figcaption>Liveshare</figcaption>
</figure>
</td>
</tr>
</table>
</center>
----
### I.5 - Where to begin ?
#### I.5-g) Extra
<center>
<table class="example-table">
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/BJEAku9HR.png" alt="">
<figcaption>????</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/rk1pJ_qBC.png" alt="">
<figcaption>Github</figcaption>
</figure>
</td>
</tr>
<tr>
<td>
<figure>
<img src="https://hackmd.io/_uploads/SkoQx_5rC.png" alt="">
<figcaption>Gitlab</figcaption>
</figure>
</td>
<td>
<figure>
<img src="https://hackmd.io/_uploads/Sk3Gxd9BR.png" alt="">
<figcaption>Git</figcaption>
</figure>
</td>
</tr>
</table>
</center>
---
### I.6 - Try an online compiler
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/ByJ2Vw9S0.png" alt="" style="height: 250px;height:300px; width: 500px">
<figcaption>Online GDB</figcaption>
</figure>
----
### I.6 - Try an online compiler
#### I.6-a) Write our first program
```cpp=
#include <iostream>
int main()
{
std::cout << "Hello World";
return 0;
}
```
----
### I.6 - Try an online compiler
#### I.6-b) Paste the code into OnlineGDB
You can use hotkey:
- `[Ctrl + A]` to select all
- `[Ctrl + X]` to cut
- `[Ctrl + C]` to copy
- `[Ctrl + V]` to paste
----
### I.6 - Try an online compiler
#### I.6-c) Select the `C++` language
In competitive programming, please consider using:
- `C`: Nah bro, we ain't gonna do that here `:(`
- `C++11`: All Vietnamese compilers work fine.
- `C++14`: Most Vietnamese compilers work fine.
- `C++17`: Some Vietnamese compilers work fine.
- `C++20`: Few Vietnamese compilers work fine.
----
### I.6 - Try an online compiler
#### I.6-d) Run the code
You can use hotkey `[F9]` or click on `[RUN]`
----
### I.6 - Try an online compiler
#### I.6-e) See the result
---
### I.7 - Explaination
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/HJmSV4VUR.png" alt="" style="height: 250px; width: 500px">
<figcaption>Lets learn C++</figcaption>
</figure>
----
### I.7 - Explaination
#### I.7-a) What are Comments
----
### I.7 - Explaination
#### I.7-b) The main function
```cpp=
// main(): the default (non-asm) function to be called first
int main()
{ // open bracket for the begin of the command of main()
... // execute these commands inside the main function
return 0; // return int(0) means the code ran successfully
} // close bracket for the end of the command of main()
```
----
### I.7 - Explaination
#### I.7-c) The iostream library
```cpp=
/** This is a valid multi-line comments
* Whatever written here will be ignored
**/
#include <iostream> // using library input-output-stream
// By default, this provide you all these things, with std::
// std::cout, std::cin, std::cerr, ...
// std::istream, std::ostream, ...
// std::endl, std::flush, ...
// std::string, std::stringstream, ...
```
----
### I.7 - Explaination
#### I.7-d) The cout statement
This is a statement to output anything inside `"..."`
```cpp=
// this "<<" is just an operator for output
// |
// v
std:: cout << "Hello World";
// ^ ^ ^^^^^^^^^^^ the output-result
// | |
// | c-out means "C++ please output"
// |
// namespace, to differentiate other function with a same name
```
----
### I.7 - Explaination
#### I.7-e) Altogether
```cpp=
// Library: Hey, could you give me some defined code for i/o ?
#include <iostream> // ok, I will give you
// C++: Hey, could you run this function first whatsoever ?
int main() // sure, I am default to be run first
{
// C++: Hey, could you output these characters for me ?
std::cout << "Hello World"; // sure, lol, why not ?
// C++: You successfully ran the code
return 0; // ok, I will return int(0)
}
```
---
### I.8 - Why do we stop here ?
----
### I.8 - Why do we stop here ?
#### I.8-a) Ignore the return
```cpp=
#include <iostream>
int main()
{
std::cout << "Hello World";
// only function main(): defaults to return zero on success
}
```
----
### I.8 - Why do we stop here ?
#### I.8-b) Writing into two parts
```cpp=
#include <iostream>
int main()
{
std::cout << "Hello " << "World";
// ^^ ^^
// || ||
// You can chain these two
// to output more
}
```
----
### I.8 - Why do we stop here ?
#### I.8-c) Writing with multiple cout
```cpp=
#include <iostream>
int main()
{
std::cout << "Hello"; // output this
std::cout << " "; // then output this
std::cout << "World"; // finally output this
}
```
----
### I.8 - Why do we stop here ?
#### I.8-d) Writing into multiple lines
```cpp=
#include <iostream>
int main()
{
std::cout << "H" // start 1st here
<< "e"; // end 1st here
std::cout << "l" // start 2nd here
<< "l" //
<< "o" //
<< " world"; // end 2nd here
return 0;
}
```
----
### I.8 - Why do we stop here ?
#### I.8-e) Writing more or less characters
```cpp=
#include <iostream>
int main()
{
// output a pack of characters of a time (string)
std::cout << "He" << "ll" << "o ";
// output each character each time
std::cout << 'W' << 'o' << 'r' << 'l' << 'd';
// notice that 'Wo' is a wide char, not string
// we can output "World" as string, but not 'World'
/// these quotes ^ ^ are different from ' '
}
```
----
### I.8 - Why do we stop here ?
#### I.8-f) Using namespace
```cpp=
#include <iostream>
using namespace std; // we can use <name> as std::<name>
int main()
{
// no need to type `std::cout`, we can use `cout` directly
cout << "Hell";
cout << "o ";
cout << "World";
}
```
---
### I.9 - Do you love math ?
----
### I.9 - Do you love math ?
#### I.9-a) Input
```cpp=
#include <iostream>
int main()
{
int a, b; // Create two int (INTEGER) types, named a and b
// ^^^ type(int) is builtin, so don't use `std::int` (invalid)
std::cin >> a >> b; // cin (C-INPUT) two variables a and b
}
```
----
### I.9 - Do you love math ?
#### I.9-b) Basic operations
```cpp=
#include <iostream>
int main()
{
int a, b;
std::cin >> a >> b;
std::cout << a + b << std::endl;
std::cout << a - b << std::endl;
// ^ endl stands for end-line
// it means we go down a line in terminal
}
```
----
### I.9 - Do you love math ?
#### I.9-c) Other common operations
```cpp=
#include <iostream>
int main()
{
int a, b;
std::cin >> a >> b;
std::cout << (a + b) << std::endl; // Add
std::cout << (a - b) << std::endl; // Subtract
std::cout << (a * b) << std::endl; // Multiply
std::cout << (a / b) << std::endl; // Integer Divide
std::cout << (a % b) << std::endl; // Mod
}
```
----
### I.9 - Do you love math ?
#### I.9-d) Comparisons
```cpp=
#include <iostream>
int main()
{
int a, b;
std::cin >> a >> b;
std::cout << (a < b) << std::endl; // Less
std::cout << (a > b) << std::endl; // Greater
std::cout << (a <= b) << std::endl; // Less or equal
std::cout << (a >= b) << std::endl; // Greater or equal
std::cout << (a == b) << std::endl; // Equal
std::cout << (a != b) << std::endl; // Different
}
```
----
### I.9 - Do you love math ?
#### I.9-e) Bitwise operations
```cpp=
#include <iostream>
int main()
{
int a, b;
std::cin >> a >> b;
std::cout << (a | b) << std::endl; // OR
std::cout << (a & b) << std::endl; // AND
std::cout << (a ^ b) << std::endl; // XOR
std::cout << (a << b) << std::endl; // SHIFT LEFT
std::cout << (a >> b) << std::endl; // SHIFT RIGHT
}
```
---
## I.10 - The End
<figure style="text-align: center;">
<img src="https://hackmd.io/_uploads/H1sr0DcBR.png" alt="" style="height:500px; width: 500px">
<figcaption>Any question ?</figcaption>
</figure>
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