Given a string str. The string may contain lower-case letters, special characters, digits or even white-spaces. The task is to check, whether only the letters present in the string are forming a Palindromic combination or not without using any extra space.
Note: It is not allowed to use extra space to solve this problem. Also, the letters present in the string are in lower-case and the string may contain special characters, digits or even white-spaces along with lowercase letters.
Input : str = “m a 343 la y a l am”
Output : YES
The characters in the string form the sequence “malayalam”, which is a palindrome.
Input : str = “malayalam”
Output : YES
- Create two utility functions to get the first and last position of characters present in the string.
- Start traversing the string, and keep finding the position of first and last characters everytime.
- If the first and last characters are same for every iteration and the string is traversed completely then print YES otherwise print NO.
Below is the implementation of above approach:
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