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int ledPin = 13;
//led for visualization (use 13 for built-in led)

int speakerPin = 11;
//speaker connected to one of the PWM ports

#define c 261
#define d 294
#define e 329
#define f 349

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/*
paper beta de grafos em linguagem C by Cooler_
contato: c00f3r[at]gmail[dot]com


O que é ?
  Em matemática e ciência da computação, grafo é o objeto básico de estudo da 
teoria dos grafos. Tipicamente, um grafo é representado como um conjunto de 
pontos (vértices) ligados por retas (as arestas). Dependendo da aplicação, as 
arestas podem ser direcionadas, e são representadas por "setas".

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//full screen width table view separator
-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{
    
    if ([tableView respondsToSelector:@selector(setSeparatorInset:)]) {
        [tableView setSeparatorInset:UIEdgeInsetsZero];
    }
    
    if ([tableView respondsToSelector:@selector(setLayoutMargins:)]) {
        [tableView setLayoutMargins:UIEdgeInsetsZero];
    }

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@interface Article : MTLModel <MTLJSONSerializing>

@property (nonatomic) NSString *title;
@property (nonatomic) NSString *body;
@property (nonatomic) NSURL *url;
@property (nonatmoic) NSDate *dateModified;


@implementation Article

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- (void)shareButtonClicked {
    //-- set strings and URLs
    NSString *textObject = @"Information that I want to tweet or share";
    NSString *urlString = [NSString stringWithFormat:@"http://www.mygreatdomain/%@", _selectedPageString];
    
    NSURL *url = [NSURL URLWithString:urlString];
    
    NSArray *activityItems = [NSArray arrayWithObjects:textObject, url,  nil];
    
    //-- initialising the activity view controller

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Question

How to implement a UITableView with a separator line like this:

Usually, you can only set the separatorLine property of a UITableView with to single line or single line etched. Sometimes, it is not enough. So, how to implement a separator line like this?

Answer

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// SomeProtocol.h
@protocol SomeProtocol <NSObject>

- (void) protocolMethod;

@end


// NSObject+SomeProtocolDefaultImplementation.h
@interface NSObject(SomeProtocolDefaultImplementation)

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@interface TMObjectThatHasLotsOfDependenciesInjected : NSObject

- (nonnull instancetype)initWithDependency:(TMDependency * __nonnull)dependency
                         anotherDependency:(TMOtherDependency * __nonnull)anotherDependency NS_DESIGNATED_INITIALIZER;
                         
/// option 1: break inheritance
- (nullable instancetype)init __attribute__((unavailable("Use initWithDependency:anotherDependency: instead")));

@end

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// Follow up to - https://gist.github.com/paulrehkugler/11063725

BOOL baseCaseCondition = NO; // obviously this should be data driven, not hardcoded

typedef void (^RecursiveBlock)(void (^)());
RecursiveBlock aRecursiveBlock;

aRecursiveBlock = ^(RecursiveBlock block){
  if ((baseCaseCondition) && block)
  {