Important String Problems | Beginner Friendly Guide (2025)

Important String Problems : Strings are everywhere in programming — from user input to text processing and coding interviews. Understanding common string problems will sharpen your problem-solving skills and prepare you for real-world coding challenges. Below are some fundamental string problems explained simply:

Important String Problems :

  • Reverse a String
  • Check whether a String is Palindrome or not
  • Find Duplicate characters in a string
  • Why strings are immutable in Java?
  • Write a Code to check whether one string is a rotation of another
  • Write a Program to check whether a string is a valid shuffle of two strings or not
  • Count and Say problem
  • Write a program to find the longest Palindrome in a string (Longest palindromic Substring)
  • Find Longest Recurring Subsequence in String
  • Print all Subsequences of a string
  • Print all the permutations of the given string
  • Split the Binary string into two substrings with equal 0’s and 1’s
  • Word Wrap Problem [VERY IMP]
  • EDIT Distance [Very Imp]
  • Find next greater number with same set of digits [Very Very IMP]
  • Balanced Parenthesis problem [Imp]
  • Word break Problem [Very Imp]
  • Rabin Karp Algorithm
  • KMP Algorithm
  • Convert a Sentence into its equivalent mobile numeric keypad sequence
  • Minimum number of bracket reversals needed to make an expression balanced
  • Count All Palindromic Subsequences in a given String
  • Count of number of given string in 2D character array
  • Search a Word in a 2D Grid of characters
  • Boyer Moore Algorithm for Pattern Searching
  • Converting Roman Numerals to Decimal
  • Longest Common Prefix
  • Number of flips to make binary string alternate
  • Find the first repeated word in string
  • Minimum number of swaps for bracket balancing
  • Find the longest common subsequence between two strings
  • Program to generate all possible valid IP addresses from given string
  • Write a program to find the smallest window that contains all characters of string itself
  • Rearrange characters in a string such that no two adjacent are same
  • Minimum characters to be added at front to make string palindrome
  • Given a sequence of words, print all anagrams together
  • Find the smallest window in a string containing all characters of another string
  • Recursively remove all adjacent duplicates
  • String matching where one string contains wildcard characters
  • Function to find Number of customers who could not get a computer
  • Transform One String to Another using Minimum Number of Given Operations
  • Check if two given strings are isomorphic to each other
  • Recursively print all sentences that can be formed from list of word lists

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