Problems on Strings to Crack your Next Coding Interview | Data Structures and Algorithm

The string is a popular topic for programming job interviews. To crack coding interviews it is imperative to practise these must do problems on strings. In this video, Scaler brings you a set of string problems to ace programming interviews. Learn more about Scaler:https://bit.ly/3iOdwoH

Before you start off with these problems, having solid knowledge of the basics of data structures and algorithms is recommended.

🔹 What is String?
A string is a data type used in programming languages that is used to represent text rather than numbers.

🔹 String Matching Algorithm

String Matching Algorithms or searching algorithms try to find places where one or several strings are found within a larger string. They are classified into different types such as naive string matching, kmp string matching, etc.

Naive string matching is the simplest form of string matching algorithm. It checks for all the main characters of the main string to the pattern. The time complexity of Naive Pattern Search method is O(m*n).KMP string matching checks the characters from left to right. The time complexity of KMP is O(n).

The following topics are covered in this video 👇🏼

0:46 Question 1- rearranging a given string
14:03 Brute force solution to question 1
18:29 Question 1 solution using hash maps
26:10 Solution using Rabin Karp method
34:00 Question 2 - Rolling Hash function
51:12 Question 3- Finding the first non-repeating character in a string
59:30 Question 4 - Finding if 2 strings are isomorphic
1:07:45 Question 5- removing pairs of duplicate characters placed together
1:17:10 Question 6 - Create a string by repeating a substring


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