Python program to sort Palindrome Words in a Sentence
Given a string S representing a sentence, the task is to reorder all the palindromic words present in the sentence in sorted order.
Examples:
Input: S = “Please refer to the madam to know the level”
Output: Please level to the madam to know the refer
Explanation: Here “refer”, “madam”, “level” are the palindromic words. Sorting them generates the sequence {“level”, “madam”, “refer”}.Input: S = “refer to dad”
Output: dad to refer
Approach: Follow the steps below to solve the problem:
- Iterate over the characters of the string.
- Split the words in the sentence by spaces using split() and store it as a list, say lis.
- Store all the palindromic words present in the sentence S in a list, say newlis[].
- Sort the list newlis[] using sort() function.
- Initialize a pointer, say j = 0.
- Traverse the list lis and replace all the palindromic words with newlis[j] and increment j by 1.
- Print the updated sentence
Below is the implementation of the above approach:
Python3
# Python implementation of above program # Function to check if a# string is a palindrome or notdef palindrome(string): if(string == string[::-1]): return True else: return False # Function to print the updated sentencedef printSortedPalindromes(sentence): # Stores palindromic words newlist = [] # Stores the words split by spaces lis = list(sentence.split()) # Traversing the list for i in lis: # If current word is palindrome if(palindrome(i)): # Update newlist newlist.append(i) # Sort the words in newlist newlist.sort() # Pointer to iterate newlis j = 0 # Traverse the list for i in range(len(lis)): # If current word is palindrome if(palindrome(lis[i])): # Replacing word with # current word in newlist lis[i] = newlist[j] # Increment j by 1 j = j + 1 # Print the updated sentence for i in lis: print(i, end =" ") # Driver Code sentence = "please refer to the madam to know the level" printSortedPalindromes(sentence) |
Output:
please level to the madam to know the refer
Time Complexity : O(N * logN)
Auxiliary Space : O(N)
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