Short Problem Definition:
Gary is an avid hiker. He tracks his hikes meticulously, paying close attention to small details like topography. During his last hike he took exactly n steps. For every step he took, he noted if it was an uphill, U, or a downhill, D step. Gary’s hikes start and end at sea level and each step up or down represents a unit change in altitude. We define the following terms:
- A mountain is a sequence of consecutive steps above sea level, starting with a step up from sea level and ending with a step down to sea level.
- 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.
time complexity is
space complexity is
I am a hiker myself, so this challenge is kinda funny. The description looks complex, but realistically one only needs to calculate whether the section was above or below sea level.
def countingValleys(n, s): level = 0 valleys = 0 for direction in s: if direction == "U": level += 1 if level == 0: valleys += 1 else: level -= 1 return valleys