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

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

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.

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

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.

I've become more of a climber now - who still keeps that time trial as strong as ever. It gives me such self-belief. I feel a different athlete.

Pets are supposedly a great way to meet people.

A lot of times I watch TV and I watch film and there's so many things I'd love to talk about that I feel don't get the opportunity to be shown. Sometimes things become very stereotypical and one-sided, and I feel like it's such a colorful world.

Like a majority of Americans in recent years, I came to understand that fear of homosexuality was leading our governments - including the one I ran as Governor of Mississippi - to deny the equal rights to an entire segment of our population that are afforded all of us under the Constitution.

To me, when a great band is playing together, it's amazing for me.

Poor, darling fellow - he died of food. He was killed by the dinner table.

If the nineteenth century was the age of the editorial chair, ours is the century of the psychiatrist's couch.

I don't like tattoos because tattoos are forever.

When I retire I'm going to spend my evenings by the fireplace going through those boxes. There are things in there that ought to be burned.

Amnesty, n. The state's magnanimity to those offenders whom it would be too expensive to punish.

When things are too easy I lose interest in them so I find ways to complicate them to get myself interested.

We got a chance to go and play in some places that the usual European tour by an American band didn't go to.

There was no television, so the radio provided you with everything.

People are scared to death and they're looking for something beyond themselves.

I love to paint, do ceramics, photography. I got a lot of side things that I like to do.

My long, blonde hair has been my trademark ever since I started modelling in the Seventies, when I was scouted sunbathing in St Tropez.

In my life, things have happened to me. I've never felt I was controlling anything.

Americans are grateful for the connection and convenience their phones provide, helping them search for a lower price, navigate a strange city, expand a customer base or track their health and finances, their family and friends.

Do what you love. When you love your work, you become the best worker in the world.

My six word love story: I can’t imagine life without you

Israel can't be the only country in the Western world not to have freedom of religion.

Change and renewal are themes in life, aren't they? We keep growing throughout life.

It is totally different making films in the East than in the West. In the East, I make my own Jackie Chan films, and it's like my family. Sometimes I pick up the camera because I choreograph all the fighting scenes, even when I'm not fighting. I don't have my own chair. I just sit on the set with everybody.

I am not a person who tries on in the stores. It drives me crazy. So I buy and take back if I don't like something. I really don't enjoy being in the dressing room. I rather just try it on in my house.