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@pathikrit
pathikrit / sudoku-1.coffee
Created October 10, 2012 07:04
1-liner CoffeeScript Sudoku Solver
solve = (s, c = 0) -> if c is 81 then s else if s[x = c/9|0][y = c%9] isnt 0 then solve s, c+1 else (([1..9].filter (g) -> ![0...9].some (i) -> g in [s[x][i], s[i][y], s[3*(x/3|0) + i/3|0][3*(y/3|0) + i%3]]).some (g) -> s[x][y] = g; solve s, c+1) or s[x][y] = 0
@franzenzenhofer
franzenzenhofer / get_barcode_from_image.js
Created September 2, 2012 16:00 — forked from tdegrunt/get_barcode_from_image.js
Barcode recognition with JavaScript - Demo: http://bit.ly/djvUoy
/*
* Copyright (c) 2010 Tobias Schneider
* This script is freely distributable under the terms of the MIT license.
*/
(function(){
var UPC_SET = {
"3211": '0',
"2221": '1',
"2122": '2',
@piscisaureus
piscisaureus / pr.md
Created August 13, 2012 16:12
Checkout github pull requests locally

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = [email protected]:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

@swannodette
swannodette / gist:3217582
Created July 31, 2012 14:52
sudoku_compact.clj
;; based on core.logic 0.8-alpha2 or core.logic master branch
(ns sudoku
(:refer-clojure :exclude [==])
(:use clojure.core.logic))
(defn get-square [rows x y]
(for [x (range x (+ x 3))
y (range y (+ y 3))]
(get-in rows [x y])))
@Samuirai
Samuirai / captcha.md
Created June 14, 2012 20:59
G-WAN Captcha Decode

G-WAN is a new free web server. They seem to be very proud of it, or at least just want to make a lot of money. Well anyway, in almost every sentence they write, they claim that they are 20% cooler than anything else. It feels a bit arrogant. I have to admit, I don't know a lot about web servers, so I can't speak to how good they are.

However, then I saw their Captcha example. I also don't know much about machine learning algorithms, OCR, and stuff like that, but I do know how to read pixels. I also know how to compare values with python :P

demo

They say the following about their Captcha:

@jboner
jboner / latency.txt
Last active May 13, 2025 17:54
Latency Numbers Every Programmer Should Know
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
@I82Much
I82Much / Scramble Solver Output.txt
Created May 30, 2012 05:27
Scramble Solver Output
FoundWord(word='a', locations=[Location(row=2, col=0)])
FoundWord(word='al', locations=[Location(row=2, col=0), Location(row=1, col=1)])
FoundWord(word='alice', locations=[Location(row=2, col=0), Location(row=1, col=1), Location(row=2, col=2), Location(row=2, col=3), Location(row=3, col=2)])
FoundWord(word='alien', locations=[Location(row=2, col=0), Location(row=1, col=1), Location(row=2, col=2), Location(row=3, col=2), Location(row=3, col=3)])
FoundWord(word='alin', locations=[Location(row=2, col=0), Location(row=1, col=1), Location(row=2, col=2), Location(row=3, col=3)])
FoundWord(word='aline', locations=[Location(row=2, col=0), Location(row=1, col=1), Location(row=2, col=2), Location(row=3, col=3), Location(row=3, col=2)])
FoundWord(word='alit', locations=[Location(row=2, col=0), Location(row=1, col=1), Location(row=2, col=2), Location(row=2, col=1)])
FoundWord(word='alite', locations=[Location(row=2, col=0), Location(row=1, col=1), Location(row=2, col=2), Location(row=2, col=1), Location(row=3, col=2)])
F
@pachacamac
pachacamac / clusterize.rb
Created May 22, 2012 19:11
Cluster algorithm for n-dimensional data and a given number of clusters
# A
# B
#
# D
#
# C
# E
#
# F
#
@jrochkind
jrochkind / gist:2636355
Created May 8, 2012 15:31
reddit 'hot' algorithm, in ruby, with typo fixed
require 'date'
# Actually doesn't matter WHAT you choose as the epoch, it
# won't change the algorithm. Just don't change it after you
# have cached computed scores. Choose something before your first
# post to avoid annoying negative numbers. Choose something close
# to your first post to keep the numbers smaller. This is, I think,
# reddit's own epoch.
$our_epoch = Time.local(2005, 12, 8, 7, 46, 43).to_time
require 'spec_helper'
describe "Brewery" do
it "makes good stuff" do
beer.should be :good
end
it "makes not too much bottles" do
@bottles.should == 10