Top 50 String Coding Problems for Interviews

Last Updated : 21 Mar, 2024

Here is the collection of the Top 50 list of frequently asked interview questions on Strings. Problems in this Article are divided into three Levels so that readers can practice according to the difficulty level step by step.

Top-50-String-Coding-Problems-for-Interviews

Level 1

Problems	Solve
Reverse words in a given string	Solve
Longest Common Prefix	Solve
Roman Number to Integer	Solve
Integer to Roman	Solve
Closest Strings	Solve
Divisible by 7	Solve
Encrypt the String – II	Solve
Equal point in a string of brackets	Solve
Isomorphic Strings	Solve
Check if two strings are k-anagrams or not	Solve
Panagram Checking	Solve
Minimum Deletions	Solve
Number of Distinct Subsequences	Solve
Check if string is rotated by two places	Solve

Level 2

Problems	Solve
Implement Atoi	Solve
Validate an IP address	Solve
License Key Formatting	Solve
Find the largest word in dictionary	Solve
Equal 0,1, and 2	Solve
Find and replace in String
Add Binary Strings	Solve
Sum of two large numbers	Solve
Multiply two strings	Solve
Look and say Pattern	Solve
Minimum times A has to be repeated to make B a Substring	Solve
Excel Sheet – I	Solve
Form a Palindrome	Solve
Find the N-th character	Solve
Next higher palindromic number using the same set of digits	Solve
Length of longest prefix suffix	Solve
Longest K unique characters substring	Solve
Smallest window in string containing all characters	Solve
Longest Palindromic Subsequence	Solve
Longest substring without repeating characters	Solve
Substrings of length k with k-1 distinct elements	Solve
Count number of substrings	Solve
Interleaved Strings	Solve
Print Anagrams together	Solve
Rank the permutation	Solve
A Special Keyboard	Solve

Level 3

Problems	Solve
Restrictive Candy Crush	Solve
Edit Distance	Solve
Search Pattern (KMP-Algorithm)	Solve
Search Pattern (Rabin-Karp Algorithm)	Solve
Search Pattern (Z-algorithm)	Solve
Shortest Common Supersequence	Solve
Number of words with K maximum distinct vowels	Solve
Longest substring to form a Palindrome	Solve
Longest Valid Parenthesis	Solve
Distinct Palindromic Substrings	Solve

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