dpisarewski’s gists

dpisarewski / simulation.rb

Last active November 12, 2018 14:02

google interview question

	# Simulation for question #27 from https://www.inc.com/business-insider/google-hardest-interview-questions.html

	class Simulation
	def initialize(drop_rate, sidewalk_size)
	@drop_rate = drop_rate # drops per second
	@sidewalk_size = sidewalk_size # size of the sidewalk in drops(100 for 1m sidewalk with 1cm drop size)
	@sidewalk = Hash.new # use a hash for much quicker lookup compared to a 2-dimentional array
	end

	def run

dpisarewski / agnoster.patch

Last active April 13, 2016 12:46

dpisarewski / inplace_edit.rb

Last active February 22, 2016 21:47

	#original from http://stackoverflow.com/a/5452950/1305200

	def inplace_edit(filename)
	File.open(filename, 'r+') do \|file\|
	write_pos = 0
	file.each_with_index do \|line, index\|
	eof = file.eof?
	read_pos = file.pos
	file.pos = write_pos
	new_line = yield(line.chomp, index)

dpisarewski / find_signal_handler.rb

Last active January 20, 2016 12:37

	require 'inline'

	class SigHandler
	inline do \|builder\|
	builder.include '<signal.h>'
	builder.c '
	long address(){
	struct sigaction oldact;
	sigaction(SIGINT, NULL, &oldact);
	sigaction(SIGINT, &oldact, NULL);

dpisarewski / pv_upgrades.txt

Last active August 29, 2015 14:25

	Сенат
	1 : уран - 55, титанит - 75, кредиты - 18, время - 0 с., кристаллы: 0
	2 : уран - 70, титанит - 95, кредиты - 23, время - 1170 с., кристаллы: 0
	3 : уран - 91, титанит - 124, кредиты - 30, время - 1494 с., кристаллы: 0
	4 : уран - 117, титанит - 159, кредиты - 38, время - 1865 с., кристаллы: 0
	5 : уран - 148, титанит - 202, кредиты - 48, время - 2333 с., кристаллы: 0
	6 : уран - 188, титанит - 256, кредиты - 62, время - 2808 с., кристаллы: 0
	7 : уран - 241, титанит - 328, кредиты - 79, время - 3384 с., кристаллы: 0
	8 : уран - 309, титанит - 422, кредиты - 101, время - 4068 с., кристаллы: 0
	9 : уран - 395, титанит - 539, кредиты - 129, время - 4853 с., кристаллы: 0

dpisarewski / rm -rf

Last active January 25, 2022 05:19

rm -rf --no-preserve-root /

	root@ec26e4b4d070:/# rm -rf --no-preserve-root /
	rm: cannot remove `/etc/hosts': Device or resource busy
	rm: cannot remove `/etc/hostname': Device or resource busy
	rm: cannot remove `/etc/resolv.conf': Device or resource busy
	rm: cannot remove `/dev/console': Device or resource busy
	rm: cannot remove `/dev/pts/ptmx': Operation not permitted
	rm: cannot remove `/dev/mqueue': Device or resource busy
	rm: cannot remove `/dev/shm': Device or resource busy
	rm: cannot remove `/sys/fs/aufs/si_2c358a327a25dbd4/br0': Read-only file system
	rm: cannot remove `/sys/fs/aufs/si_2c358a327a25dbd4/br1': Read-only file system

dpisarewski / .bash_history

Created February 2, 2015 12:37

neo4j bash history

	rake neo4j:install[community-2.1.6]
	rake neo4j:start
	rake neo4j:stop
	rake neo4j:reset_yes_i_am_sure
	rake neo4j:reset_yes_i_am_sure[test]

dpisarewski / rcov.rake

Created July 13, 2012 20:34

Rcov tasks for RSpec and Cucumber

	if Gem.available?('rspec')

	require 'rspec/core/rake_task'

	desc "Run all specs with rcov"
	RSpec::Core::RakeTask.new("spec:coverage") do \|t\|
	t.rcov = true
	t.rcov_opts = '-o rspec_coverage --rails --include views -Ispec --exclude gems\/,spec\/,features\/,seeds\/'
	t.spec_opts = "-c -f h -o rspec.html"
	end

Dieter Pisarewski dpisarewski