OL Coding Challenge

ViewController.m

//
//  ViewController.m
//  OL_Coding_One
//
//  Created by Abdullah Kahn on 10/19/18.
//  Copyright © 2018 Sifted. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    NSString *letter = [NSString stringWithFormat:@"abc"];
    NSString *magazine = [NSString stringWithFormat:@"abcd"];
    BOOL doesMagazineContainLetter = [self checkIfLetterInMagazine:letter magazine:magazine];
    
    if (doesMagazineContainLetter) {NSLog(@"TRUE");} else {NSLog(@"FALSE");}
  
}

-(BOOL)checkIfLetterInMagazine:(NSString *)letter magazine:(NSString *)magazine {
    
    NSMutableDictionary *dict = [NSMutableDictionary new];
    
    for (int i=0;i<letter.length;i++) {
        NSString *letterAtIndex = [NSString stringWithFormat:@"%c",[letter characterAtIndex:i]];
        
        if ([dict objectForKey:letterAtIndex] == nil) {
            [dict setObject:[NSNumber numberWithInt:0] forKey:letterAtIndex];
        } else {
            NSString *countString = [dict objectForKey:letterAtIndex];
            int count = countString.intValue;
            [dict setObject:[NSNumber numberWithInt:++count] forKey:letterAtIndex];
        }
    }
    
    for (int i=0;i<magazine.length;i++) {
        
        NSString *letterAtIndex = [NSString stringWithFormat:@"%c",[magazine characterAtIndex:i]];
        
        if ([dict objectForKey:letterAtIndex]) {
            NSString *countString = [dict objectForKey:letterAtIndex];
            int count = countString.intValue;
            
            if (count == 0) {
                [dict removeObjectForKey:letterAtIndex];
            } else {
                [dict setObject:[NSNumber numberWithInt:--count] forKey:letterAtIndex];
            }
        }
    }
    
    if  (dict.allKeys.count == 0) {
        return TRUE;
    } else {
        return FALSE;
    }
    
}


@end