# Tag: string

The “Group Anagrams” problem is a common coding challenge that is often given to software engineers during technical interviews. Essentially, the problem involves grouping a list of words into sets of anagrams – that is, words that are made up of the same letters but in a different order. For example, the words “listen” and […]

strStr() is a function that takes two strings as input, haystack and needle, and returns the index of the first occurrence of needle in haystack, or -1 if needle is not present in haystack. For example, if haystack = “hello world” and needle = “world”, then the function should return 6, because “world” first appears […]

The Reverse Integer problem is a programming challenge that asks you to reverse the digits of a given integer. For example, if you’re given the number 123, you should return the number 321. Now, it’s important to note that there are a few rules to keep in mind while solving this problem. For one, you […]

“String to Integer (atoi)” is a coding problem that requires you to convert a given string to its corresponding integer value. Here’s a more detailed explanation of the problem: Problem Statement: Implement the atoi function that converts a string to an integer. The function first discards as many whitespace characters as necessary until the first […]

Longest Palindromic Substring refers to finding the longest contiguous substring in a given string that is a palindrome, which is a sequence of characters that reads the same backward as forward. For example, in the string “babad”, the longest palindromic substring is “bab”, which is a palindrome because it reads the same backward as forward. […]

The problem “Longest Substring Without Repeating Characters” is a classic algorithmic problem in computer science. Given a string, the task is to find the length of the longest substring within the string that does not contain any repeated characters. For example, consider the input string “abcabcbb”. The longest substring without repeating characters is “abc”, which […]

Using datetime library in your choice of language makes it easy to write a program to find the number of days between two dates. We write code with and without using the library. Let’s first find the number of days between two dates with using a library: 1. Prompt the user to enter the first […]