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Writing programming interview questions hasn't made me rich yet ... so I might give up and start trading Apple stocks all day instead.

First, I wanna know how much money I could have made yesterday if I'd been trading Apple stocks all day.

So I grabbed Apple's stock prices from yesterday and put them in a list called stock_prices , where:

indices values

So if the stock cost $500 at 10:30am, that means stock_prices[60] = 500 .

Write an efficient function that takes stock_prices and returns the best profit I could have made from one purchase and one sale of one share of Apple stock yesterday.

the best profit I could have made from one purchase and one sale of one share of Apple stock yesterday.

For example:

No "shorting"—you need to buy before you can sell. Also, you can't buy and sell in the same time step—at least 1 minute has to pass.

You can't just take the difference between the highest price and the lowest price , because the highest price might come the lowest price. And you have to buy before you can sell.

What if the price ? In that case, the best profit will be negative .

You can do this in O ( n ) O(n) O ( n ) time and O ( 1 ) O(1) O ( 1 ) space!

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Megan Pohlmeier wanted to wear her US Army sash to graduation, but was denied her request. (Megan Pohlmeier)

A Nebraska high school is speaking out and defending its actions after receiving major backlash on social media for denying a graduating senior’s request to wear her U.S. Army sash during the graduation ceremony.

Megan Pohlmeier was planning on participating in her high school’s graduation ceremony in May. To celebrate the occasion, the teen said she wanted to wear her Army sash, which was given to her by her recruiter at the Grand Island office in Nebraska four days before graduation, she told Fox News.

Pohlmeier said she called the school to see if she could wear the black and yellow sash during the ceremony.

"It was something I worked really hard to earn. They told me ‘no’ and did not really give me a reason," she told the Omaha World-Herald .

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Pohlmeier’s father also tried calling the school, but Principal Thomas Szlanda told him the same thing.

Despite being told no, Pohlmeier decided to wear her sash tucked under her graduation gown so she could take pictures with it after the ceremony. (Megan Pohlmeier)

Despite being told no, Pohlmeier decided to wear her sash tucked under her graduation gown so she could take pictures with it after the ceremony.

However, Principal Szlanda saw the sash peeking out under the black gown and pulled her out of line, she said.

“He pulled me out of line and said, ‘I talked to you and your father and you are not to be wearing that. If I see you wearing that again, you will not receive your diploma,’” she told the World-Herald.

Since the graduation, which Pohlmeier did participate in sans sash, her story has gone viral on Facebook with many calling the school's actions “unacceptable” and “disrespectful.”

Now, Hastings Public Schools Superintendent Craig Kautz is defending his school’s graduation accessories policy, saying “if we don’t award it, you don’t wear it.”

Hastings Public Schools Superintendent Craig Kautz said he believed the student was told she could not wear her sash visibly for the ceremony, but should have been allowed to tuck it into her gown. (Megan Pohlmeier)

“The rule is in place to prevent student’s writing the silly ‘Hi, Mom’ on the hat and goofy things. We’re trying to keep our graduations somewhat dignified,” Kautz told Fox News.

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