Check if both halves of the string have same set of characters in Python

Given a string of lowercase characters only, the task is to check if it is possible to split a string from middle which will gives two halves having the same characters and same frequency of each character. If the length of the given string is ODD then ignore the middle element and check for the rest.


Input : abbaab
Output : NO
The two halves contain the same characters
but their frequencies do not match so they

Input : abccab
Output : YES

This problem has existing solution, please refer Check if both halves of the string have same set of characters link. We will solve this problem in Python quickly using Dictionary comparison.

Approach is very simple :

  1. Break string in two parts and convert both parts into dictionary using Counter(iterator) method, each dictionary contains it’s character as key and frequency as value.
  2. Now compare these two dictionaries. In python we can compare two using == operator, it first checks keys of both dictionaries are same or not, then it checks for values of each key. If everything is equal that means two dictionaries are identical.




# Function to Check if both halves of
# the string have same set of characters
from collections import Counter
def checkTwoHalves(input):
    length = len(input)
    # Break input string in two parts
    if (length % 2 != 0):
        first = input[0:length / 2]
        second = input[(length / 2) + 1:]
        first = input[0:length / 2]
        second = input[length / 2:]
    # Convert both halves into dictionary and compare
    if Counter(first) == Counter(second):
        print 'YES'
        print 'NO'
# Driver program
if __name__ == "__main__":
    input = 'abbaab'




Don’t stop now and take your learning to the next level. Learn all the important concepts of Data Structures and Algorithms with the help of the most trusted course: DSA Self Paced. Become industry ready at a student-friendly price.

My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using or mail your article to See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.