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__weak typeof(self) weakSelf = self;

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- (NSRange)rangeOfRegularExpressionPattern:(NSString *)pattern inString:(NSString *)string
{
    NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:pattern options:nil error:nil];
    NSTextCheckingResult *result = [expression firstMatchInString:string options:nil range:NSMakeRange(0, [string length])];
    
    return result.range;
}

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__weak typeof(self) weakSelf = self;

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- (void)centerViewGroupInY:(NSArray *)views withFixedSpace:(CGFloat)space options:(NSLayoutFormatOptions)options
{
    if (![views count])
        return;
    
    NSMutableString *mutableConstraint = [@"V:|[topSpacer(==bottomSpacer)]" mutableCopy];
    UIView *topSpacer, *bottomSpacer;
    NSDictionary *metrics = @{@"space":@(space)};
    NSMutableDictionary *viewsMutableDictionary = [NSMutableDictionary dictionary];
    

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- (void)setImage:(UIImage *)image withCornerRadius:(CGFloat)cornerRadius
{
    UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 1.0);
    [[UIBezierPath bezierPathWithRoundedRect:self.bounds cornerRadius:cornerRadius] addClip];
    [image drawInRect:self.bounds];
    self.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
}

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@weakify(self)
[[self.firstTextField rac_signalForControlEvents:UIControlEventEditingDidEndOnExit]
  subscribeNext:^(id x) {
  @strongify(self)
  [self.secondTextField becomeFirstResponder];
}];

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NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy-MM-dd'T'HH:mm:ss";

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func greatestCommonDivisor(first: Int, second: Int) -> Int {
    return internalPrivateGreatestCommonDivisor(first, second, min(first, second))
}

private func internalPrivateGreatestCommonDivisor(first: Int, second: Int, divider: Int) -> Int {
    
    if divider == 0 {
        return 0
    }
    

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struct HeightedUnion {
    
    typealias QuickUnionRootHeight = (root: Int, height: Int)
    
    private var ids: [Int]
    
    // Complexity: O(n)
    init(_ N: Int) {
        ids = Array(0..<N)
    }

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extension Array where Element: Comparable {
    // This implementations are inspired in https://github.com/python/cpython/blob/master/Lib/bisect.py
    
    /// Return the index where to insert value in the receiver, assuming the receiver is sorted
    ///
    /// - Parameters:
    ///   - value: The position of the text in current context
    ///   - min: The lower bound where to perform the search
    ///   - max: The upper bound where to perform the search
    /// - Returns: An index such that all elements in self[:i] have element < value, and all elements in