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BOJ

BOJ - 13168 - ๋‚ด์ผ๋กœ ์—ฌํ–‰

June 22 2022

```python import sys def solution(): _discount = {โ€œMugunghwaโ€ : 0, โ€œITX-Saemaeulโ€ : 0, โ€œITX-Cheongchunโ€ : 0, โ€œS-Trainโ€ : 0.5 , โ€œV-Trainโ€ : 0.5} _city...

BOJ - 6185 - Clear And Present Danger

November 26 2020

```python import sys _INF = 1e9 def solution(): N, M = map(int, sys.stdin.readline().split()) dist = [] maps = [] for _ in range(M): ...

BOJ - 10282 - ํ•ดํ‚น

November 03 2020

```python import sys from heapq import heappush, heappop INF = 1e9 def Dijkstra(K, graph, V): heap = [] distance = [INF] * (V +1) distance[K] = 0...

BOJ - 2064 - IP ์ฃผ์†Œ

October 05 2020

```python import sys def solution(): N = int(input()) ip = [] for _ in range(N): ip.append(sys.stdin.readline().strip().split(โ€˜.โ€™))

BOJ - 1111 - IQ Test

October 01 2020

```python def solution(): N = int(input()) number = list(map(int, input().split()))

BOJ - 2293 - ๋™์ „ 1

September 27 2020

```python def solution(): coin = [] N, K = map(int, input().split(โ€˜ โ€˜)) coin.append(0) for _ in range(N): coin.append(int(input()))

BOJ - 17829 - 222-ํ’€๋ง

September 20 2020

```python def recursive(arr, N, x1, y1, x2, y2): if N == 2: ret = [] for i in range(x1, x2): for j in range(y1, y2): ...

BOJ - 2512 - ์˜ˆ์‚ฐ

September 19 2020

```python def solution(): N = int(input()) arr = list(map(int, input().split())) money = int(input()) left, right = 0, max(arr)

BOJ - 1486 - ๋“ฑ์‚ฐ

September 18 2020

```python import sys INF = 314152965 def solution(): N, M, T, D = map(int, sys.stdin.readline().split())

BOJ - 13015 - ๋ณ„ ์ฐ๊ธฐ - 23

September 15 2020

```python def drawFirstLastLine(N): for i in range(4 * N - 3): if N <= i <= 3 * N - 4:print(โ€œ โ€œ, end=โ€โ€) else: print(โ€œ*โ€, end=โ€โ€) ...

BOJ - 4378 - ํŠธใ…ใ…Š;

August 23 2020

```python KeyBoard = { โ€œ1โ€ : โ€œ`โ€, โ€œ2โ€ : โ€œ1โ€, โ€œ3โ€ : โ€œ2โ€, โ€œ4โ€ : โ€œ3โ€, โ€œ5โ€ : โ€œ4โ€, โ€œ6โ€ : โ€œ5โ€, โ€œ7โ€ : โ€œ6โ€, โ€œ8โ€ : โ€œ7โ€, โ€œ9โ€ : โ€œ8โ€, โ€œ0โ€ : โ€œ9โ€, โ€œ-โ€œ : โ€œ0โ€, โ€œ=โ€ : โ€œ-โ€œ...

BOJ - 15829 - Hashing

August 23 2020

```python def solution(): L = int(input()) string = input() ret = 0 for i in range(L): ret += (ord(string[i]) - 96) * (31 ** i) print(ret % 12...

BOJ - 7596 - MP3 Songs

August 22 2020

```python def solution(): cnt = 1 while True: N = int(input()) if not N: break array = []

BOJ - 3041 - N-ํผ์ฆ

July 05 2020

```python def solution(): ret = 0 for i in range(4): Puzzle = list(input()) for j in range(4): if Puzzle[j] != โ€˜.โ€™: ...

BOJ - 1919 - ์• ๋„ˆ๊ทธ๋žจ ๋งŒ๋“ค๊ธฐ

July 03 2020

```python def solution(): alphabet = [โ€˜aโ€™, โ€˜bโ€™, โ€˜cโ€™, โ€˜dโ€™, โ€˜eโ€™, โ€˜fโ€™, โ€˜gโ€™, โ€˜hโ€™, โ€˜iโ€™, โ€˜jโ€™, โ€˜kโ€™, โ€˜lโ€™, โ€˜mโ€™, โ€˜nโ€™, โ€˜oโ€™, โ€˜pโ€™, โ€˜qโ€™, โ€˜rโ€™, โ€˜sโ€™, โ€˜tโ€™,...

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Programming

Java equals()์™€ == ์˜ ์ฐจ์ด์ 

November 23 2019

equals() ๋ฉ”์†Œ๋“œ๋Š” ๋น„๊ต์žํ•˜๋Š” ๋Œ€์ƒ์˜ ๋‚ด์šฉ ์ž์ฒด๋ฅผ ๋น„๊ตํ•˜์ง€๋งŒ, == ์—ฐ์‚ฐ์ž๋Š” ๋น„๊ตํ•˜๊ณ ์ž ํ•˜๋Š” ๋Œ€์ƒ์˜ ์ฃผ์†Œ๊ฐ’์„ ๋น„๊ตํ•ฉ๋‹ˆ๋‹ค.

Python

November 08 2019

[Python] ๋ฌธ์ž์—ด์˜ ๋ฉ”๋ชจ๋ฆฌ ํ• ๋‹น ๋ฐฉ์‹

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Computer Science

MTBF, MTTR, MTTF, ๊ฐ€์šฉ์„ฑ ๊ฐœ๋…

October 12 2022

MTBF, MTTR, MTTF ์„ค๋น„ ๋ณด์ „์˜ ์‹ ๋ขฐ์„ฑ ์ง€ํ‘œ๋กœ ์‚ฌ์šฉํ•ฉ๋‹ˆ๋‹ค. ์ด๋Š” ํ•˜๋“œ์›จ์–ด ์ œํ’ˆ ๋˜๋Š” ๊ตฌ์„ฑ ์š”์†Œ์˜ ์„ฑ๋Šฅ, ์žฅ๋น„ ์„ค๊ณ„, ์‹ ๋ขฐ์„ฑ ๋ฐ ์•ˆ์ „์— ๋Œ€ํ•œ ์ค‘์š”ํ•œ ์œ ์ง€๊ด€๋ฆฌ ์กฐ์น˜์ž…๋‹ˆ๋‹ค.

Dining Philosophers Problem

November 08 2019

์„ธ๋งˆํฌ์–ด์™€ ๋ฎคํ…์Šค, DeadLock๊ณผ ๊ฐ™์€ ๊ฐœ๋…์„ ๋ชจ๋ฅด์‹ ๋‹ค๋ฉด ํ”„๋กœ์„ธ์Šค์™€ ์Šค๋ ˆ๋“œ์™€ ์ž„๊ณ„์˜์—ญํฌ์ŠคํŠธ๋ฅผ ๋ณด๊ณ ์˜ค์‹œ๋ฉด ๋ฉ๋‹ˆ๋‹ค.

Bankerโ€™s Algoirhtm

November 08 2019

์„ธ๋งˆํฌ์–ด์™€ ๋ฎคํ…์Šค, DeadLock๊ณผ ๊ฐ™์€ ๊ฐœ๋…์„ ๋ชจ๋ฅด์‹ ๋‹ค๋ฉด ํ”„๋กœ์„ธ์Šค์™€ ์Šค๋ ˆ๋“œ์™€ ์ž„๊ณ„์˜์—ญํฌ์ŠคํŠธ๋ฅผ ๋ณด๊ณ ์˜ค์‹œ๋ฉด ๋ฉ๋‹ˆ๋‹ค.

SSL / TLS

November 03 2019

SSL (Secure Socket Layer)

HTTP

November 03 2019

HTTP (HyperText Transfer Protocol)

Public Key / Private Key

November 02 2019

๊ณต๊ฐœ ํ‚ค ์•”ํ˜ธ ๋ฐฉ์‹ (Public-Key Cryptography)

Cache

November 01 2019

Caches

Virtual Memory

October 27 2019

๊ฐ€์ƒ ๋ฉ”๋ชจ๋ฆฌ

Process Scheduling

October 27 2019

ํ”„๋กœ์„ธ์Šค ์Šค์ผ€์ฅด๋ง(Process Scheduling)

Process / Thread

October 23 2019

ํ”„๋กœ์„ธ์Šค vs ์Šค๋ ˆ๋“œ

Kernel

October 23 2019

์ปค๋„

DataBase

October 23 2019

SQL(Structed Query Language)

C vs Java vs Python

October 23 2019

์ปดํŒŒ์ผ๋Ÿฌ ์–ธ์–ด vs ์ธํ„ฐํ”„๋ฆฌํ„ฐ ์–ธ์–ด

Kruskal / Prim Algorithm

October 15 2019

๋จผ์ € kruskal๊ณผ prim์•Œ๊ณ ๋ฆฌ์ฆ˜์„ ์•Œ๊ธฐ์ „์— MST๋ฅผ ์•Œ์•„์•ผ ํ•ฉ๋‹ˆ๋‹ค.

Data Link Layer

October 15 2019

๋ฐ์ดํ„ฐ ๋งํฌ ๊ณ„์ธต (Data Link Layer)

Transport Layer

October 10 2019

์ „์†ก ๊ณ„์ธต(Transport Layer)

Network Layer

October 10 2019

๋„คํŠธ์›Œํฌ ๊ณ„์ธต(Network Layer)

Struct

October 07 2019

๊ตฌ์กฐ์ฒด ํฌ๊ธฐ๋ฅผ ๊ตฌํ•˜๊ธฐ์ „ ๊ตฌ์กฐ์ฒด์™€ ์ž๋ฃŒํ˜• ํฌ๊ธฐ์— ๋Œ€ํ•ด์„œ ์ •๋ฆฌ๋ฅผ ํ•˜๊ณ  ์‹œ์ž‘ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค.

MVC

October 05 2019

MVC (Model - View - Controller)

CI / CD

October 05 2019

CI (์ง€์†์ ์ธ ํ†ตํ•ฉ, Continuous Integration)

TDD

October 04 2019

TDD Test-Driven Development(TDD)๋Š” ๋งค์šฐ ์งง์€ ๊ฐœ๋ฐœ ์‚ฌ์ดํด์˜ ๋ฐ˜๋ณต์— ์˜์กดํ•˜๋Š” ์†Œํ”„ํŠธ์›จ์–ด ๊ฐœ๋ฐœ ํ”„๋กœ์„ธ์Šค์ด๋‹ค. ์šฐ์„  ๊ฐœ๋ฐœ์ž๋Š” ์š”๊ตฌ๋˜๋Š” ์ƒˆ๋กœ์šด ๊ธฐ๋Šฅ์— ๋Œ€ํ•œ ์ž๋™ํ™”๋œ ํ…Œ์ŠคํŠธ์ผ€์ด์Šค๋ฅผ ์ž‘์„ฑํ•˜๊ณ  ํ•ด๋‹น ํ…Œ์ŠคํŠธ๋ฅผ ํ†ต๊ณผํ•˜๋Š” ๊ฐ€์žฅ ๊ฐ„๋‹จํ•œ ์ฝ”๋“œ๋ฅผ ์ž‘์„ฑํ•œ๋‹ค. ์ผ๋‹จ ํ…Œ์ŠคํŠธ ํ†ต๊ณผํ•˜๋Š”...

REST

October 04 2019

REST ์›”๋“œ ์™€์ด๋“œ ์›น(World Wide Web a.k.a WWW)๊ณผ ๊ฐ™์€ ๋ถ„์‚ฐ ํ•˜์ดํผ๋ฏธ๋””์–ด ์‹œ์Šคํ…œ์„ ์œ„ํ•œ ์†Œํ”„ํŠธ์›จ์–ด ์•„ํ‚คํ…์ฒ˜์˜ ํ•œ ํ˜•์‹์œผ๋กœ ์ž์›์„ ์ •์˜ํ•˜๊ณ  ์ž์›์— ๋Œ€ํ•œ ์ฃผ์†Œ๋ฅผ ์ง€์ •ํ•˜๋Š” ๋ฐฉ๋ฒ• ์ „๋ฐ˜์— ๋Œ€ํ•œ ํŒจํ„ด

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Books

[๋ฆฌ๋ทฐ]๋‚˜๋ฅผ ์•Œ๊ณ  ์‹ถ์„ ๋•Œ ๋‡Œ๊ณผํ•™์„ ๊ณต๋ถ€ํ•ฉ๋‹ˆ๋‹ค - ๋‡Œ๊ฐ€ ๋ฉˆ์ถ˜ ์ˆœ๊ฐ„, ์‚ถ์ด ์‹œ์ž‘๋˜์—ˆ๋‹ค

September 03 2022

[๋ฆฌ๋ทฐ]๋‚˜๋ฅผ ์•Œ๊ณ  ์‹ถ์„ ๋•Œ ๋‡Œ๊ณผํ•™์„ ๊ณต๋ถ€ํ•ฉ๋‹ˆ๋‹ค - ๋‡Œ๊ฐ€ ๋ฉˆ์ถ˜ ์ˆœ๊ฐ„, ์‚ถ์ด ์‹œ์ž‘๋˜์—ˆ๋‹ค

[๋ฆฌ๋ทฐ]๋งˆ์ดํด ์ƒŒ๋ธ, ์ค‘๊ตญ์„ ๋งŒ๋‚˜๋‹ค - ์ค‘๊ตญ์˜ ๋ˆˆ์œผ๋กœ ๋ฐ”๋ผ๋ณธ ๋งˆ์ดํด ์ƒŒ๋ธ์˜ โ€˜์ •์˜โ€™

June 19 2022

[๋ฆฌ๋ทฐ]๋งˆ์ดํด ์ƒŒ๋ธ, ์ค‘๊ตญ์„ ๋งŒ๋‚˜๋‹ค - ์ค‘๊ตญ์˜ ๋ˆˆ์œผ๋กœ ๋ฐ”๋ผ๋ณธ ๋งˆ์ดํด ์ƒŒ๋ธ์˜ โ€˜์ •์˜โ€™

[๋ฆฌ๋ทฐ]์‚ฌํ”ผ์—”์Šค - ์œ ์ธ์›์—์„œ ์‚ฌ์ด๋ณด๊ทธ๊นŒ์ง€ ์ธ๊ฐ„ ์—ญ์‚ฌ์˜ ๋Œ€๋‹ดํ•˜๊ณ  ์œ„๋Œ€ํ•œ ์งˆ๋ฌธ

June 04 2022

[๋ฆฌ๋ทฐ]์‚ฌํ”ผ์—”์Šค - ์œ ์ธ์›์—์„œ ์‚ฌ์ด๋ณด๊ทธ๊นŒ์ง€ ์ธ๊ฐ„ ์—ญ์‚ฌ์˜ ๋Œ€๋‹ดํ•˜๊ณ  ์œ„๋Œ€ํ•œ ์งˆ๋ฌธ

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BlockChain

Peer

October 27 2019

Anchor Peer

Nonce

October 27 2019

Hyperledger Fabric Nonce

Hyperledger Network ๊ตฌ์„ฑ (BYFN)

October 23 2019

๊ธฐ์กด ํฌ์ŠคํŠธ ๊นŒ์ง€๋Š” orderer์˜ ํƒ€์ž…์„ solo๋กœ์™€ kafka ๋†“๊ณ  ์ง„ํ–‰ํ–ˆ์Šต๋‹ˆ๋‹ค. ์ด๋ฒˆ ํฌ์ŠคํŠธ์—์„œ๋Š” raft๋ฅผ ์ด์šฉํ•ด์„œ ๋งŒ๋“ค์–ด ๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค.

Hyperledger Network ๊ตฌ์„ฑ (BYFN)

October 23 2019

๊ธฐ์กด ํฌ์ŠคํŠธ ๊นŒ์ง€๋Š” orderer์˜ ํƒ€์ž…์„ solo๋กœ ๋†“๊ณ  ์ง„ํ–‰ํ–ˆ์Šต๋‹ˆ๋‹ค. ์ด๋ฒˆ ํฌ์ŠคํŠธ์—์„œ๋Š” kafka๋ฅผ ์ด์šฉํ•ด์„œ ๋งŒ๋“ค์–ด ๋ณด๊ฒ ์Šต๋‹ˆ๋‹ค.

Hyperledger Indy Getting Started

October 17 2019

์ด ํฌ์ŠคํŠธ๋Š” Hyperledger Korea User Group์—์„œ ๋งŒ๋“  ๊ธ€์„ ๋ฐ”ํƒ•์œผ๋กœ ๋งŒ๋“ค์—ˆ์Šต๋‹ˆ๋‹ค.

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Life

SW Maestro 10th ํ›„๊ธฐ -4- ๋งˆ์ง€๋ง‰ ํ›„๊ธฐ

February 28 2020

์ด ํฌ์ŠคํŠธ๋ฅผ ์ฝ์œผ์‹œ๋Š” ๋ถ„์€ ์†Œํ”„ํŠธ์›จ์–ด ๋งˆ์—์ŠคํŠธ๋กœ์— ๋Œ€ํ•ด ๋งŽ์€ ๊ด€์‹ฌ์ด ์žˆ์„๊ฑฐ๋ผ๊ณ  ์ƒ๊ฐํ•ฉ๋‹ˆ๋‹ค.

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Spring

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DevOps

Docker์™€ Python Flask ๋ฅผ ์ด์šฉํ•œ ์นด์นด์˜คํ†ก ํ”Œ๋Ÿฌ์Šค์นœ๊ตฌ ๊ฐœ๋ฐœ ๊ณผ ๋ฐฐํฌ -2-

November 13 2019

์ด์ „์— Goorm์„ ์‚ฌ์šฉํ–ˆ๋Š”๋ฐ Docker๋ฅผ ๋ณด์•ˆ์ƒ์˜ ์ด์œ ๋กœ ์‚ฌ์šฉ์„ ์ œํ•œํ•ด ๋†จ์Šต๋‹ˆ๋‹ค. ๊ทธ๋ž˜์„œ ๋ถ€๋“์ดํ•˜๊ฒŒ Docker๋กœ ๋ฐฐํฌํ•˜๋Š” ๋ถ€๋ถ„๋งŒ AWS์—์„œ ์ž‘์—…ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค.

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Server

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Linux

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DataBase

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OS X

macOS ํŒจํ‚ค์ง€ ๊ด€๋ฆฌ์ž Homebrew ์„ค์น˜ ๋ฐ ์‚ฌ์šฉํ•˜๊ธฐ

May 11 2020

ํ™ˆ๋ธŒ๋ฃจ(Homebrew)๋Š” ์ž์œ -์˜คํ”ˆ ์†Œ์Šค ์†Œํ”„ํŠธ์›จ์–ด ํŒจํ‚ค์ง€ ๊ด€๋ฆฌ ์‹œ์Šคํ…œ์ž…๋‹ˆ๋‹ค. ๊ฐœ๋ฐœ์ž ์ž…์žฅ์—์„œ ๋งฅ OS ๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด ์–ป๊ฒŒ๋˜๋Š” ํฐ ์ด์ ์ค‘ ํ•˜๋‚˜๊ฐ€ ์ด Homebrew ์ž…๋‹ˆ๋‹ค.

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