yrong’s gists

yrong / pivot.js

Created August 31, 2019 13:25 — forked from parshap/pivot.js

Find pivot index

	// Return the "pivot index" of the given array of numbers. The pivot index is
	// the index where the sum of the numbers on the left is equal to the sum of
	// the numbers on the right.
	function pivot(numbers) {
	validateInput(numbers);

	// Find a pivot index by testing each index
	for (var i = 0; i < numbers.length; i++) {
	var leftSum = sum(numbers.slice(0, i));
	var rightSum = sum(numbers.slice(i + 1));

yrong / install_python.ps1

Created December 17, 2018 07:59 — forked from carlosfunk/install_python.ps1

Powershell scripts for setting up a Python environment under Windows

	# To run this file you will need to open Powershell as administrator and first run:
	# Set-ExecutionPolicy Unrestricted
	# Then source this script by running:
	# . .\install_python.ps1

	$save_dir=Resolve-Path ~/Downloads
	$project_dir = "C:\Projects"
	$virtualenv_dir = $project_dir + "\virtualenvs"

	$client = New-Object System.Net.WebClient

yrong / nodejs_installer.ps1

Created November 26, 2018 09:21 — forked from nweldev/nodejs_installer.ps1

Powershell script installing nodejs (with git) and some npm packages

	write-host "`n ## NODEJS INSTALLER ## `n"

	### CONFIGURATION

	# nodejs
	$version = "4.4.7-x64"
	$url = "https://nodejs.org/dist/latest-v4.x/node-v$version.msi"

	# git
	$git_version = "2.9.2"

yrong / postgresql.py

Created July 30, 2018 01:06 — forked from robertsosinski/postgresql.py

DataDog script for collecting PostgreSQL stats

	# Create the datadog user with select only permissions:
	# CREATE USER datadog WITH PASSWORD '<complex_password>';
	#
	# Grant select permissions on a table or view that you want to monitor:
	# GRANT SELECT ON <schema>.<table> TO datadog;
	#
	# Grant permissions for a specific column on a table or view that you want to monitor:
	# GRANT SELECT (id, name) ON <schema>.<table> TO datadog;
	#
	# Let non-superusers look at pg_stat_activity in a read-only fashon.

yrong / learn.lua

Created June 8, 2018 07:42 — forked from tylerneylon/learn.lua

Learn Lua quickly with this short yet comprehensive and friendly script. It's written as both an introduction and a quick reference. It's also a valid Lua script so you can verify that the code does what it says, and learn more by modifying and running this script in your Lua interpreter.

	-- Two dashes start a one-line comment.

	--[[
	Adding two ['s and ]'s makes it a
	multi-line comment.
	--]]

	----------------------------------------------------
	-- 1. Variables and flow control.
	----------------------------------------------------

yrong / crawler.go

Created May 30, 2018 11:11 — forked from avalanche123/crawler.go

A Tour of Go. Exercise: Web Crawler

	package main

	import (
	"fmt"
	)

	type Fetcher interface {
	// Fetch returns the body of URL and
	// a slice of URLs found on that page.
	Fetch(url string) (body string, urls []string, err error)

yrong / golang-nuts.go

Created March 15, 2018 01:38 — forked from ryanfitz/golang-nuts.go

two ways to call a function every 2 seconds

	package main

	import (
	"fmt"
	"time"
	)

	// Suggestions from golang-nuts
	// http://play.golang.org/p/Ctg3_AQisl

yrong / epoll.go

Created March 8, 2018 10:04 — forked from tevino/epoll.go

Golang example for using epoll

	package main

	import (
	"fmt"
	"net"
	"os"
	"syscall"
	)

	const (

yrong / ipfspub.js

Created February 26, 2018 09:17 — forked from chrismatthieu/ipfspub.js

	var msgSend;
	var counter = 0
	setInterval(function(){
	msgSend = new Buffer(counter.toString());
	ipfs.pubsub.publish(topic, msgSend, (err) => {
	if (err) {
	throw err
	}
	// msg was broadcasted
	})

yrong / btree.hpp

Created February 24, 2018 07:41 — forked from zhenghaoz/btree.hpp

B Tree

	#include <memory>
	#include <vector>
	#include <iostream>

	template <unsigned N, typename Key, typename Value>
	class BTree
	{
	template <typename T> using vector = std::vector<T>;
	template <typename T> using shared_ptr = std::shared_ptr<T>;

Ron yrong