In this reposotory you will find some exercises's HackerRank but first I invite you to try resolve them. Good luck!!

Use collections where look for pairs in a list.

Example: n = 7 ar = [1,2,1,2,1,3,2]

The number of pairs is 2.

Use loop for to determinate level dependig character U/D uphill or downhill. Determinate number of valleys. A valley is a sequence of consecutive steps below sea level, starting with a step down from sea level and ending with a step up to sea level.

Example

steps = 8 path = [UDDDUDUU]

_/\      _
   \    /
    \/\/

Answer: 1 valley