Well, it doesn't matter, right?
At the end of the day, the question is how many guys are left with their cock dry, no which ones.

Depends how many women there are. When there are two 10 Chads and two women, both Chads get one chick (the first chick chooses one Chad randomly, the other picks the one without a girlfriend, so the other Chad).
But if there is a 9 and a 10 Chad, the 10 gets both girls, and the 9 is left with his hand.

Because that's the minus first octave

Obviously, both parties have to agree on dating, so even if a woman wants a man, he has a say too. If he can get a better chick, he'll go for that instead.
"never settle for a man who's not at least 2 levels above their own" means that a women who's a 5 will only date men 7 or above.
The general dating order is stated at the end in your second quote.
Please clarify more what is not understandable.

hell yes. thank you

Keystroke is a countable noun:

...calculate how MANY keystrokes you have to do for a specific word...
Return the NUMBER of keystrokes...

This is really good

The Start() function is called multiple times on the same Timer object in the tests. You should probably get rid of the unique_ptr, and join the already running thread with every Start().

In the input, the i-th number is the number of the friend who was given a present by friend number i. Currently the opposite is stated.

Brilliant news! My first approved

Blimey, this is absolutely new for me. I didn't know those keywords existed in C++.

Input contains array with N integers: the i-th number is j - the number of a friend who gave a gift to friend number i.
Return array with N integers: the i-th number should equal the number of the friend who gave a gift to friend number i.

So return the exact same array then.
The description needs reformulating. Personally I find that there's quite a bit annoying extra information in it too.

beautiful