Rohit Kothari rohitkothari

Inspired by this article. Neat tricks for speeding up integer computations.

Note: cin.sync_with_stdio(false); disables synchronous IO and gives you a performance boost. If used, you should only use cin for reading input (don't use both cin and scanf when sync is disabled, for example) or you will get unexpected results.

Multiply by a power of 2

x = x << 1; // x = x * 2

What I actually did

/etc/security/limits.conf

elasticsearch hard memlock 100000

/etc/default/elasticsearch

Git-workflow vs feature branching

When working with Git, there are two prevailing workflows are Git workflow and feature branches. IMHO, being more of a subscriber to continuous integration, I feel that the feature branch workflow is better suited, and the focus of this article.

If you are new to Git and Git-workflows, I suggest reading the atlassian.com Git Workflow article in addition to this as there is more detail there than presented here.

I admit, using Bash in the command line with the standard configuration leaves a bit to be desired when it comes to awareness of state. A tool that I suggest using follows these instructions on setting up GIT Bash autocompletion. This tool will assist you to better visualize the state of a branc

AWS S3 bucket and IAM policy recipes

Recipes

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	angular.module('myApp',
	['ngRoute', 'myApp.services', 'myApp.directives']
	)
	.config(function(AWSServiceProvider) {
	AWSServiceProvider.setArn('arn:aws:iam::<ACCOUNT_ID>:role/google-web-role');
	})
	.config(function(StripeServiceProvider) {
	StripeServiceProvider.setPublishableKey('pk_test_YOURKEY');
	})
	.config(function($routeProvider) {

	## credit: http://fabian-affolter.ch/blog/the-lineinfile-module-of-ansible/
	---
	- hosts: alpine_install
	user: root

	tasks:
	# - name: create a complete empty file
	# command: /usr/bin/touch /test/test.conf

	- name: create a new file with lineinfile

	# This gist is compatible with Ansible 1.x .
	# For Ansible 2.x , please check out:
	# - https://gist.github.com/dmsimard/cd706de198c85a8255f6
	# - https://github.com/n0ts/ansible-human_log

	# This program is free software: you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#

	MIT License

	Copyright (c) 2021 Ryo Nakamura

	Permission is hereby granted, free of charge, to any person obtaining a copy
	of this software and associated documentation files (the "Software"), to deal
	in the Software without restriction, including without limitation the rights
	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	copies of the Software, and to permit persons to whom the Software is
	furnished to do so, subject to the following conditions:

	packer build packer.json 2>&1 \| sudo tee output.txt
	tail -2 output.txt \| head -2 \| awk 'match($0, /ami-.*/) { print substr($0, RSTART, RLENGTH) }' > sudo ami.txt