First practice question

Didn't know points get deducted by the minute. Even though time is
unlimited, after 75 mins the points bottom out. I got 90.07 pts for this
300-pt problem
Psh, too easy

Got 182.39 pts for 200-pt problem. SRM 144 Div 2
SRM 154 DIV 1 - 134.39 pts for 350pt problem

The tl;dr version of the problem is, find the substring of code in
keyPresses, but the tricky part is, consequetive chars in the code has
to be greater than the ones in keyPresses.

So my approach was to let regex to the work. I set a lower bound of
repeatability, but no upper bound. Took me a while to get it right
though.