gistfile1.txt

#import <Foundation/Foundation.h>

/**
 *  Takes an array of people to be arranged for Secret Santa and returns a dictionary where each person is a key and
 *  the corresponding value for each person is the other person to whom they will give.
 *
 *  @param inputArray Array of people playing Secret Santa
 *
 *  @return The dictionary from giver (key) to recipient (value)
 */
    
@interface NSArray (Random)

- (id)randomObject;

@end
    
@implementation NSArray (Random)

-(id)randomObject {
    NSUInteger myCount = [self count];
    if (myCount) 
        return [self objectAtIndex:arc4random_uniform(myCount)];
    else
        return nil;
}

@end

static NSDictionary *pairSecretSantas(NSArray *inputArray)
{
    NSMutableDictionary *pairedSantas = [NSMutableDictionary new];
    // Iterate over the input array and pair givers/receivers.
    NSMutableArray *inputArrayM = [inputArray mutableCopy]; 
    for (NSString *f in inputArray) {
            NSString *flinstoneChar = [inputArrayM randomObject];
        //NSString *flinstoneChar2 = [inputArray randomObject];
            if (![f isEqualToString:flinstoneChar]) 
                {
                    [pairedSantas setObject:f forKey:flinstoneChar];
                    [inputArrayM removeObject:flinstoneChar];
                }
            else  if ([f isEqualToString:flinstoneChar]){
                   
            }
    }
    NSLog(@"%@", pairedSantas);
    // No person can be a giver more than once
    // No person can receive more than one present
    return pairedSantas;