Palindrome String Coding Problems Last Updated : 09 Apr, 2025 Comments Improve Suggest changes Like Article Like Report A string is called a palindrome if the reverse of the string is the same as the original one.Example: “madam”, “racecar”, “12321”.Palindrome StringProperties of a Palindrome String:A palindrome string has some properties which are mentioned below:A palindrome string has a symmetric structure which means that the character in the first half of the string are the same as in the rear half but in reverse order.Any string of length 1 is always a palindrome.Easy Problems:Check if PalindromeSentence PalindromePalindromic binary representationLongest palindrome word All Palindrome WordsRearrange characters for palindromeLexicographically first palindromic stringLongest Non-palindromic substringMinimum insertions to form a palindromeSmallest Palindrome after replacementRemove character from string to make palindrome. Print all palindromes in a given rangeSum of first K even-length Palindrome numbersMedium Problems:Minimum removal to make palindrome permutationCharacter Positions for Palindrome Formationrotation of a palindromelargest palindrome by changing at most K-digitsMinimum deletions to make string palindromeLongest palindrome by removing or shuffling charsPrint all Palindrome permutationsAll Palindromic sub-stringsCount Palindromic substrings in an Index rangeLongest Possible Chunked PalindromeLargest palindromic number by permuting digitsLexicographically smallest palindrome with minimal changesStrings of length N with no palindromic sub stringCheck if any anagram of a string is palindrome or notCount maximum-length palindromesNext greater palindromic number Hard Problems:Minimum insertions to form a palindromeLongest Palindromic SubstringChecking palindrome in a streamPalindrome PartitioningPrint all palindromic partitionsCount All Palindromic SubsequencePrint Longest Palindromic SubsequenceMinimum characters to add for palindrome stringPalindrome Substring QueriesPalindrome pair in an array of wordsMinimum steps to delete a stringNext smallest palindromeClosest Palindrome NumberCount palindromic characteristics of a StringNumber of valid insertions to form palindrome.Minimum Palindromic Cuts with RearrangementPalindrome by swapping one characterQuick Links:Recent articles on Palindrome‘Practice Problems’ on Strings‘Quizzes’ on Strings Comment More infoAdvertise with us Next Article Palindrome String H harendrakumar123 Follow Improve Article Tags : Strings DSA palindrome Practice Tags : palindromeStrings Similar Reads Palindrome String Coding Problems A string is called a palindrome if the reverse of the string is the same as the original one.Example: “madamâ€, “racecarâ€, “12321â€.Palindrome StringProperties of a Palindrome String:A palindrome string has some properties which are mentioned below:A palindrome string has a symmetric structure which m 2 min read Palindrome String Given a string s, the task is to check if it is palindrome or not.Example:Input: s = "abba"Output: 1Explanation: s is a palindromeInput: s = "abc" Output: 0Explanation: s is not a palindromeUsing Two-Pointers - O(n) time and O(1) spaceThe idea is to keep two pointers, one at the beginning (left) and 13 min read Check Palindrome by Different LanguageProgram to Check Palindrome Number in CPalindrome numbers are those numbers that remain the same even after reversing the order of their digits. In this article, we will learn how to check whether the given number is a palindrome number using C program.ExamplesInput: 121Output: YesExplanation: The number 121 remains the same when its dig 3 min read C Program to Check for Palindrome StringA string is said to be palindrome if the reverse of the string is the same as the string. In this article, we will learn how to check whether the given string is palindrome or not using C program.The simplest method to check for palindrome string is to reverse the given string and store it in a temp 4 min read C++ Program to Check if a Given String is Palindrome or NotA string is said to be palindrome if the reverse of the string is the same as the original string. In this article, we will check whether the given string is palindrome or not in C++.ExamplesInput: str = "ABCDCBA"Output: "ABCDCBA" is palindromeExplanation: Reverse of the string str is "ABCDCBA". So, 4 min read Java Program to Check Whether a String is a PalindromeA string in Java can be called a palindrome if we read it from forward or backward, it appears the same or in other words, we can say if we reverse a string and it is identical to the original string for example we have a string s = "jahaj " and when we reverse it s = "jahaj"(reversed) so they look 8 min read Easy Problems on PalindromeSentence Palindrome Given a sentence s, the task is to check if it is a palindrome sentence or not. A palindrome sentence is a sequence of characters, such as a word, phrase, or series of symbols, that reads the same backward as forward after converting all uppercase letters to lowercase and removing all non-alphanumer 9 min read Check if actual binary representation of a number is palindrome Given a non-negative integer n. The problem is to check if binary representation of n is palindrome or not. Note that the actual binary representation of the number is being considered for palindrome checking, no leading 0’s are being considered. Examples : Input : 9 Output : Yes (9)10 = (1001)2 Inp 6 min read Print longest palindrome word in a sentence Given a string str, the task is to print longest palindrome word present in the string str.Examples: Input : Madam Arora teaches Malayalam Output: Malayalam Explanation: The string contains three palindrome words (i.e., Madam, Arora, Malayalam) but the length of Malayalam is greater than the other t 14 min read Count palindrome words in a sentence Given a string str and the task is to count palindrome words present in the string str. Examples: Input : Madam Arora teaches malayalam Output : 3 The string contains three palindrome words (i.e., Madam, Arora, malayalam) so the count is three. Input : Nitin speaks malayalam Output : 2 The string co 5 min read Check if characters of a given string can be rearranged to form a palindrome Given a string, Check if the characters of the given string can be rearranged to form a palindrome. For example characters of "geeksogeeks" can be rearranged to form a palindrome "geeksoskeeg", but characters of "geeksforgeeks" cannot be rearranged to form a palindrome. Recommended PracticeAnagram P 14 min read Lexicographically first palindromic string Rearrange the characters of the given string to form a lexicographically first palindromic string. If no such string exists display message "no palindromic string". Examples: Input : malayalam Output : aalmymlaa Input : apple Output : no palindromic string Simple Approach: 1. Sort the string charact 13 min read Like