How to solve string coding questions?

Strings are touted as one of the most crucial DSA concepts!

Among a chock-full of coding questions, string coding questions have the high chances of being asked by the interviewer.

Afterall, they have the right to know about your DSA knowledge and analyze your coding skills to check if you are suitable for the company or not.

Due to their high prevalence in the day to day coding, string questions hold weightage in the interviews.

Therefore, it is essential for you to have a solid foundation on this topic and to know the knits and grits related to strings.

Hence, gain knowledge on strings with the help of this blog and learn how to solve the string related questions with ease and efficiency.

Without any ado, let’s get started!

Solving string related questions

String is touted as the sequence of certain characters which are either literal constant or some sort of variable. Its elements can either be mutated or lengths can be easily changed.

The variety of questions on strings, reversing a string , palindrome strings, detecting substring and on other string related topics can be asked from the candidates. Whether you are preparing hard to crack Global Logic interview questions, Amazon interview questions, Google interview questions and any other tech giants interview questions you need to have a strong base on the topic of string.

In order to solve the string coding questions with ease, you should follow the below-mentioned steps:

• Start with the basic terminology and concepts related to string

• Try to build a strong foundation on string by knowing all its basic concepts

• Firstly, take up the easy string questions and solve all the questions by developing a multi-solution approach

• After you are clear with the basics, move to the medium or moderate level of difficulty questions.

• Analyse the medium level difficulty questions, write the program and develop a strong foundation on them

• Then you can move to the highly advanced string questions. You should have a solid string foundation in order to solve these questions

• You can also take the help of additional resources to cover all the necessary details related to string questions

• Jump to the mock tests and previously asked questions in the coding exams and solve them. This will help you better analyse your performance and where you are standing in terms of your string preparation

How to solve different string coding questions?

Below we have compiled some of the most commonly asked string interview questions that every candidate should know to excel at this topic.

Check if a string can be rotated as palindrome or not

A string is given in this case. You need to check if it can be rotated as palindrome or not.

For instance; CBAABCD is the rotated palindrome string as it is the rotation of a palindrome.

Here, you can follow the naive solution to check if the given string has any rotation that is palindrome or not. Return true, if its rotation is palindrome. Otherwise, return as false.

Determine if two given strings are anagram

Any word which produces letters in any other word is called an anagram. The words X and Y are considered as anagrams as by the arrangement of letters in X, you can get Y.

For instance; all these given pairs are the anagrams as ihs will be rearranged into rhs.

Here silent would be listen

Incest will be insect

Problem of longest palindrome subsequence

A string is given. You have to find the length of the contiguous substring which is also the palindrome.

For instance; longest palindromic substring of the word ‘ banana’ is ‘anana’

Though, this problem differs from finding the problem of longest palindromic subsequence as the substrings are needed to occupy the consecutive positions in regards to the consecutive positions with that of the original string.

The solution of this problem can be found with the help of dynamic programming as we can take the time and space complexity. The idea is quite simple as each character in a string will be considered as the midpoint of the palindrome in order to find its maximum length.

Isomorphic strings

Two strings are given, X and Y. These strings are called isomorphic if the occurrence of all its characters in the x will get replaced by the other character so as to get y.

A naive solution can be helpful in order to check whether the characters of a given first string can easily be mapped with all the same character of its second string through its occurrences. We can map the characters of the first string with the same characters of the second one.

Print all the strings in the zigzag form in the k rows

A string with the positive integer k is given in the zigzag form. Identify the pattern in the given problem . we can observe the patterns by considering the character index.

Find the palindrome permutation in a given string

You know that the left and the right half of a palindrome have the same characters. The palindrome permutations are only possible in the case when you get the strings of all characters in the frequency in a given string.

Determine if a given string is palindrome or not

Write the program to find if the given string is palindrome or not. A string is palindrome if it remains the same when the characters are reversed. The simple solution here would be to reverse the strings and compare all the original strings with the reversing string or not.

Remove the extra spaces from the string

Write the program to in-place all the extra spaces in a given string. There may be leading or trail spaces between the words in a string. The solution can be to handle it with the help of the punctuation marks.

Wrapping Up

Keep this guide as your mentor to crack the string coding questions with grace and efficiency!

Whether you are rooting for Global Logic interview questions or any other company interview question, don’t take the risk of leaving this topic.

All the best!