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//based on the solution of iamamused : https://gist.github.com/iamamused/1955318
@implementation UIImage (ImageFromPDF)

+ (UIImage *)imageLoadedFromPDF:(NSString *)filePath fitSize:(CGSize)fitSize shouldCacheAsAFile:(BOOL)storeInFile{
    // Determine if the device is retina.
    BOOL isRetina = [UIScreen instancesRespondToSelector:@selector(scale)] && [[UIScreen mainScreen] scale] == 2.0;
    
    // Create a file manager so we can check if the image exists and store the image.
    NSFileManager *fileManger = [NSFileManager defaultManager];

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//Create an image about the screen of the iOS device
+ (UIImage *) screenshot{

    UIWindow *mainWindow = [[[UIApplication sharedApplication] windows] firstObject];
    
    if(UIGraphicsBeginImageContextWithOptions != NULL)
    {
        UIGraphicsBeginImageContextWithOptions(mainWindow.frame.size, NO, 0.0f);
    } else {
        UIGraphicsBeginImageContext(mainWindow.frame.size);

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/**
 *  Upload an image to twitter to get media_id for is
 *
 *  @param img        The image (UIImage or NSData) to be uploaded
 *  @param completion
 */
- (void)sendTweetWithImage:(id)img withCompletion:(void(^)(NSNumber *mediaID, NSError *error))completion {
    
    NSURL *requestURL = [[NSURL alloc] initWithString:@"https://upload.twitter.com/1.1/media/upload.json"];

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- (void)sendTweetWithExperienceInfo:(NSDictionary*)info withCompletion:(void(^)(NSError *error))completion
{

    //Create basic post info.

    NSString *status = [self tweetWithDescrition:[expInfo objectForKey:@"statusMessage"] withHeyLetsShortURL:expInfo[@"url"]];
    
    __block NSMutableDictionary *message = [@{
                                      @"status": status,
                                      } mutableCopy];

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- (void) postTwitterStatus:(NSDictionary *)statusParameters withCompletion:(void(^)(NSError *error))completion {
    NSAssert(twitterIsSetUp && self.accounts.count > 0, @"To post something to twitter, the twitter API should be set up already");
    
    ACAccount *twitterAccount = [self.accounts objectAtIndex:0];
    
    NSURL * requestURL = [NSURL URLWithString:@"https://api.twitter.com/1.1/statuses/update.json"];
    
    SLRequest *postRequest = [SLRequest
                              requestForServiceType:SLServiceTypeTwitter

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protocol LoadableView {
    static func loadViewFromNibName(nibName: String) -> Self
}

extension LoadableView {
    /**
     Default protocol implementation to load a view from nib!
     */
    static func loadViewFromNibName(nibName: String) -> Self {
        let nibViews = NSBundle.mainBundle().loadNibNamed(nibName, owner: nil, options:nil)

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    extension NSObjectProtocol where Self: NSManagedObject {
        
        static func findAllWithPredicate(searchTerm: NSPredicate?, inContext context: NSManagedObjectContext = NSManagedObjectContext.MR_defaultContext()) -> [Self] {
        
            //You can implement the fetchrequest here by yourself, but now I'm using MagicalRecord service to keep it simple
            return self.MR_findAllWithPredicate(searchTerm, inContext: context) as! [Self]
        }
    }

Usage (There is no cast required here, but the result is a [AnswerObject]):

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// Codility - CountFactors
// Count factors of given number n.
// https://codility.com/demo/take-sample-test/count_factors/

function solution(N) {
    // write your code in JavaScript (Node.js 6.4.0)

    if (N <= 2) {
        return N;
    }

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// Solution for CountNonDivisible (Codility)
// Not the best, just O(N^2)...
// https://codility.com/programmers/lessons/11-sieve_of_eratosthenes/count_non_divisible/

function solution(A) {
    // write your code in JavaScript (Node.js 6.4.0)
    
    const divisors = A.map(e => 0);
    
    for (let i = 0; i<A.length; i++) {

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// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
// Not so optimal...
// Lesson: https://codility.com/programmers/lessons/17-dynamic_programming/min_abs_sum/

function solution(A) {
    
    if (!A.length) {
        return 0;
    }