pathikrit

/**
 * Solves the n-Queen puzzle in O(n!)
 * Let p[r] be the column of the queen on the rth row (must be exactly 1 queen per row)
 * There also must be exactly 1 queen per column and hence p must be a permuation of (0 until n)
 * There must be n distinct (col + diag) and n distinct (col - diag) for each queen (else bishop attacks)
 * @return returns a Iterator of solutions 
 *     Each solution is an array p of length n such that p[i] is the column of the queen on the ith row
 */
def nQueens(n: Int): Iterator[Seq[Int]] = 
  (0 until n)

SteveGilham

package operator

object Functional {
    class PipedObject[T] private[Functional] (value:T)
    {
        def |>[R] (f : T => R) = f(this.value)
    }
    implicit def toPiped[T] (value:T) = new PipedObject[T](value)
}

JuPfu

/*
 * Copyright (C) 2014 Juergen Pfundt
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software

Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

kerryrodden

license: apache-2.0

benbalter

# Bulk convert shapefiles to geojson using ogr2ogr
# For more information, see http://ben.balter.com/2013/06/26/how-to-convert-shapefiles-to-geojson-for-use-on-github/

# Note: Assumes you're in a folder with one or more zip files containing shape files
# and Outputs as geojson with the crs:84 SRS (for use on GitHub or elsewhere)

#geojson conversion
function shp2geojson() {
  ogr2ogr -f GeoJSON -t_srs crs:84 "$1.geojson" "$1.shp"
}

alwerner

// make change to .gitignore

git rm --cached <filename>

// or, for all files

git rm -r --cached .
git add .

// then

alvinj

#!/bin/bash

#------------------------------------------------------------------------------
# Name:    sbtmkdirs
# Version: 1.5
# Purpose: Create an SBT project directory structure with a few simple options.
# Author:  Alvin Alexander, http://alvinalexander.com
# License: Creative Commons Attribution-ShareAlike 2.5 Generic
#          http://creativecommons.org/licenses/by-sa/2.5/
#------------------------------------------------------------------------------

iurisilvio

fibs = {0: 0, 1: 1}

def _fib(n):
    if n in fibs: return fibs[n]
    if n % 2 == 0:
        fibs[n] = ((2 * fib((n / 2) - 1)) + fib(n / 2)) * fib(n / 2)
        return fibs[n]
    else:
        fibs[n] = (fib((n - 1) / 2) ** 2) + (fib((n+1) / 2) ** 2)
        return fibs[n]

tzuryby

hash32 = lambda value: hash(value) & 0xffffffff