HackerRank Solution: Counting Valleys

(IN PYTHON 3)

import math

import os

import random

import re

import sys

# Complete the countingValleys function below.

def countingValleys(n, s):

c = v = 0

for i in s:

if(c == -1 and i == ‘U’):

v +=1

if(i == ‘D’):

c -=1

else:

c +=1

return v

if __name__ == ‘__main__’:

fptr = open(os.environ[‘OUTPUT_PATH’], ‘w’)

n = int(input())

s = input()

result = countingValleys(n, s)

fptr.write(str(result) + ‘\n’)

fptr.close()