strings

124+ posts

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

CSES Solutions - Letter Pair Move Game

Last Updated: 19 May 2024

There are 2n boxes in a line. Two adjacent boxes are empty, and all other boxes have a letter "A" or "B". Both letters appear in exactly n-1 boxes.Your task is to move the...read more

Check string for all uppercase-lowercase or first uppercase and rest lowercase characters

Last Updated: 28 March 2024

Given a string S, the task is to check if all the characters in S are in lowercase, or all the characters are in uppercase or only the first character is in uppercase, and...read more

Strings

DSA

strings

How to Convert a String to an Long in Java ?

Last Updated: 23 July 2025

In Java, String to Integer Conversion is not always effective as the size of the String can overpass Integer. In this article, we will learn the method provided by the Lon...read more

Java Program to Capitalize the First Letter of Each Word in a String

Last Updated: 23 July 2025

In Java Programming, we can be able to capitalize the first letter of each word in the given String value by using toUpperCase(), toLowerCase(), and another one is substri...read more

How to Shuffle Characters in a String in Java?

Last Updated: 23 July 2025

In this article, we will learn how to shuffle characters in a String by using Java programming. For this, we have taken a String value as input and the method is available...read more

How to Remove Duplicates from a String in Java Using Regex ?

Last Updated: 23 July 2025

In Java programming, Regex (regular expressions) is a very important mechanism. It can be used to match patterns in strings. Regular expressions provide a short and simple...read more

How to Find the Intersection of Two Strings in Java?

Last Updated: 23 July 2025

We know that the Strings are a collection of characters so if we want to find the intersection of two Strings the simple way is we can compare each character of the first ...read more

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