Given a string, your task is to count the number and length of arrow symbols in that string and
return an int using the following rules:
- The string will only contain the characters
.,-,=,<,>. - An arrow must start with either
<or>. - Arrows are scored based on their length and direction, for example:
- (Left-facing arrows are scored as negative, while Right-facing arrows are positive)
> is scored as 1-> is scored as 2< is scored as -1<- is scored as -2
- An arrow's tail (if it has one) must be entirely made up of either
-or=. You cannot mix. - So,
-->would be a valid arrow of length 3, but=->would only count->as a part of the arrow. - Additionally, arrows with a tail of
=are scored twice as high as arrows with a tail of-, for example:--> is scored as 3==> is scored as 6<= is scored as -4
- Double-sided arrows, like
<->or<===>are counted as0. .is an empty character and cannot be the tail of an arrow.
arrow_search('>.') # 1
arrow_search('<--..') # -3
arrow_search('><=><--') # -2
arrow_search('>===>->') # 11