Given an input string, write a function that returns the Run Length Encoded string for the input string. For example, if the input string is ‘wwwwaaadexxxxxx’, then the function should return ‘w4a3d1e1x6’.
Examples:
Input : str = 'wwwwaaadexxxxxx'
Output : 'w4a3d1e1x6'
This problem has existing solution please refer Run Length Encoding link. Here we will solve this problem quickly in python using OrderedDict. Approach is very simple, first we create a ordered dictionary which contains characters of input string as key and 0 as their default value, now we run a loop to count frequency of each character and will map it to it’s corresponding key.
Implementation:
Python3
from collections import OrderedDict
def runLengthEncoding( input ):
dict = OrderedDict.fromkeys( input , 0 )
for ch in input :
dict [ch] + = 1
output = ''
for key,value in dict .items():
output = output + key + str (value)
return output
if __name__ = = "__main__" :
input = "wwwwaaadexxxxxx"
print (runLengthEncoding( input ))
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Another code:
Python3
def encode(message):
encoded_message = ""
i = 0
while (i < = len (message) - 1 ):
count = 1
ch = message[i]
j = i
while (j < len (message) - 1 ):
if (message[j] = = message[j + 1 ]):
count = count + 1
j = j + 1
else :
break
encoded_message = encoded_message + str (count) + ch
i = j + 1
return encoded_message
encoded_message = encode( "ABBBBCCCCCCCCAB" )
print (encoded_message)
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Last Updated :
21 Jul, 2022
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