debasishg

Basics

1. The Log-Structured Merge-Tree (LSM-Tree)
2. B-Tree vs Log-Structured Merge-Tree
3. Modern B-tree techniques
4. LSM-based Storage Techniques: A Survey

B-trees and CPU Caches

1. B-tree Indexes and CPU Caches by Goetz Graefe and Per-Åke Larson

PJUllrich

Big-O Time Complexities for Elixir data structures

Map [1]

Operation	Time Complexity
Access	O(log n)
Search	O(log n)
Insertion	O(n) for <= 32 elements, O(log n) for > 32 elements [2]
Deletion	O(n) for <= 32 elements, O(log n) for > 32 elements

adibenc

version: "3"

networks:
 kong-net:
  driver: bridge

services:

  #######################################
  # Postgres: The database used by Kong

ck3g

defmodule Solution do
#Enter your code here. Read input from STDIN. Print output to STDOUT
end

array_length = IO.read(:stdio, :line)
array = IO.read(:stdio, :line)

array_length
    |> String.trim
    |> String.to_integer

gakuzzzz

Design Patterns in Scala

Scala でよく見るパターン

Type-Safe Builder

Javaで多引数のコンストラクタを避けるために使われる Builder パターンは、Scala では名前付き引数呼び出しが使えるので必要ありません。

Builderパターンに制約を加えて条件に合わない場合、コンパイルエラーにしたい。

BichengLUO

ffmpeg -y -i input.mp4 -vf fps=10,scale=716:-1:flags=lanczos,palettegen palette.png
ffmpeg -i input.mp4 -i palette.png -filter_complex "fps=10,scale=716:-1:flags=lanczos[x];[x][1:v]paletteuse" output.gif

nikneroz

Elixir + Phoenix Framework + Guardian + JWT + Comeonin

Preparing environment

We need to generate secret key for development environment.

mix phoenix.gen.secret
# ednkXywWll1d2svDEpbA39R5kfkc9l96j0+u7A8MgKM+pbwbeDsuYB8MP2WUW1hf

Let's generate User model and controller.

wojteklu

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

f0k

#include <stdio.h>
#include <cuda.h>
#include <cuda_runtime_api.h>

/* Outputs some information on CUDA-enabled devices on your computer,
 * including compute capability and current memory usage.
 *
 * On Linux, compile with: nvcc -o cuda_check cuda_check.c -lcuda
 * On Windows, compile with: nvcc -o cuda_check.exe cuda_check.c -lcuda
 *

HoLyVieR

#!/usr/bin/python
#
# Derived from:
#
# MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
#
# Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
# rights reserved.
#
# License to copy and use this software is granted provided that it