strings

131+ posts

Find the Smallest Greater Date with Same Digits

Last Updated: 18 August 2026

Given a date in the format dd mm yyyy, rearrange its digits to form a valid date that is greater than the given date. The new date must:Use exactly the same digits as the ...read more

DSA

date-time-program

strings

Non-Repetitive String

Last Updated: 31 July 2026

Given a string s consisting of uppercase English letters, determine whether it is a non-repetitive string. A string is called non-repetitive if every occurrence of the sam...read more

DSA

strings

Check if Any Common String Exists in Two Arrays

Last Updated: 26 July 2026

Given two arrays of strings s[] and t[] of sizes n and m, respectively, find if they share at least one common string.Examples:Input: s[] = ["cake", "pastry", "fish", "can...read more

DSA

strings

Assign Short Codes in Stream of Words

Last Updated: 20 July 2026

A railway department is renaming several cities, and the corresponding railway station codes must also be updated.Given an array cities[] containing the names of n cities ...read more

Distinct Characters In Sorted Manner

Last Updated: 18 July 2026

Given a string s, return a string containing all distinct characters from s in non-decreasing order, without using any sorting algorithm.Examples:Input: s = "abdbc"Output:...read more

Last Updated: 10 July 2026

Given a string s consisting of lowercase English letters. Each letter corresponds to a number on a standard keypad, as shown in the figure. Replace every character in s wi...read more

DSA

strings

DSA

Palindrome With K Insertions

Last Updated: 03 July 2026

Given a string s and an integer k, determine whether s can be converted into a palindrome using exactly k insertions. In a single insertion, any character may be inserted ...read more

DSA

Algorithms-Dynamic Programming

strings

Prefix and Suffix Pair Count

Last Updated: 19 March 2026

Given an array of strings arr[], count the number of pairs (i, j) such that i j and the string arr[i] is both a prefix and a suffix of the string arr[j].Examples:Input: a...read more

DSA

strings

Conversion Between String, StringBuilder, and StringBuffer

Last Updated: 20 February 2026

In Java, String, StringBuilder, and StringBuffer are used to handle text data, but they differ in mutability and thread safety. Understanding how to convert between them i...read more

Maximum Non-Overlapping Odd Palindrome Sum

Last Updated: 31 July 2025

Given a string s consisting of lowercase English letters, find the maximum possible sum of the lengths of any two non-empty and non-overlapping palindromic substrings of o...read more

DSA

strings

Minimize Difference

Last Updated: 24 July 2025

Given an array arr[] of strings, where each string represents a time in 24-hour format ("HH:MM:SS"), find the minimum absolute difference in seconds between any two time v...read more

DSA

strings

ASCII Range Sum

Last Updated: 28 July 2025

Given a string s consisting of lowercase English letters, identify all characters whose first and last occurrences are at different positions.For each such character, comp...read more

Commonly Asked Data Structure Interview Questions on Strings

Last Updated: 23 July 2025

Strings are essential data structures used to represent sequences of characters and are frequently encountered in coding interviews. Questions often focus on string manipu...read more

Check for Binary String

Last Updated: 27 February 2026

Given a string s, the task is to check if it is a binary string or not. A binary string is a string which only contains the characters '0' and '1'.Examples:Input: s = "010...read more

Strings

DSA

strings

Concatenation of Two Strings

Last Updated: 07 March 2026

String concatenation is the process of joining two strings end-to-end to form a single string.ExamplesInput: s1 = "Hello", s2 = "World"Output: "HelloWorld"Explanation: Joi...read more

Computer Science Fundamentals

strings

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