Note that there's no difference between n even and n odd in the first iteration.

Heap's algorithm generates all possible permutations of n objects.

It generates each permutation from the previous one by interchanging a single pair of elements; the other n-2 elements are not disturbed

First set a counter i to 0. Now we perform the following steps repeatedly until i is equal to n.

We use the algorithm to generate the (n-1)! permutations of the first n-1 elements, adjoining the last element to each of these.

Thus we generate all of the permutations that end with the last element.

Then if n is odd, we switch the first element and the last one.

If n is even, we switch the i-th element with the last one.

Now we add one to the counter i and repeat.

In each iteration, the algorithm will produce all of the permutations that end with the element that has just been moved to the "last" position.

When you're starting off as a young writer, you look at all the stuff that's gone before and the stuff that's influenced you, and you reach the ladle of your imagination into this bubbling stew pot of all of this stuff, and you pour it out. And that's where you start from.

Black Sabbath was written on bass: I just walked into the studio and went, bah, bah, bah, and everybody joined in and we just did it.

I have never made a friend from whom I could not separate, and I have never made an enemy that I could not approach.

If we are not careful, we will convey the message that investigators have to be perfect. Not true!

You must get engaged with people who are far less privileged than you. I think you must devote your time if not your resources... Because it is very, very important from the point of view of the development of our country.

Society needs both justice and compassion, a head and a heart, if it is to be civilised.

Influencers Š " Šthey're the best thing since sliced bread. But forget bread; they're selling like hot cakes. They're creating huge returns, and they're only set to keep growing!

There's a woman I see who's not my therapist, but she's like an old friend who's a therapist in profession. She lets me talk to her like a therapist once in a while, and she does a great thing. Whenever I have a big dilemma, like this is a big problem in my life, she always says, 'Wow, you're going to have to figure that out.'

Time can be an enemy or a friend.

I am a son of Detroit. I was born in Detroit.

But, if you observe children learning in their first few years of life, you can see that they can and do learn on their own - we leave them alone to crawl, walk, talk, and gain control over their bodies. It happens without much help from parents.

At CNN, our view is that good journalism equals good business.

If your dreams don’t scare you, they are not big enough.

This is the lesson that history teaches: repetition.

Most buildings, whether they're Gothic cathedrals or Romanesque ones, were high tech for their time.

If anything, game development is even more of a team effort than making a movie, so for individuals to get credit for making a game is absolutely insane.

The great benefactors of individuals and of communities are the enlightened educators: the wise-teaching, mental and moral instructors and exemplars of our times.

Most comedians want to be the architect of their own embarrassment. They have horrible self esteem issues. I would rather push myself into the mud. I dont want to be pushed into the mud. I think that is probably true. I think most people struggle with self acceptance. But comedians get a chance to self externalize.

I like that 'Mad Men' is now an adjective I use to describe clothing when I'm shopping: 'I like this top. It's very 'Mad Men.'

A certain amount of anger doesn't make us less empathetic, less humane, less loving. It just makes us real.

Therefore in medicine we ought to know the causes of sickness and health.

Never before has a civilization reached such a degree of a contempt for life; never before has a generation, drowned in mortification, felt such a rage to live.

Loyalty isn't grey. It's black and white. You're either loyal completely, or not loyal at all.

There's a lot of bad isms floating around this world, but one of the worst is commercialism.