21 String Programming Together With Coding Interview Questions Alongside Solutions
In this article, I am going to portion 21 of the most mutual String based Programming as well as Coding interview questions from Java developer interviews. These questions require y'all to write code to solve the occupation as well as they are dissimilar from traditional Java String questions similar how substring method plant inward Java or when to purpose the intern() method of String inward Java? Since coding as well as occupation solving is an of import component of whatever programming chore interview, it's imperative that y'all know how to solve them inward fourth dimension as well as on pressure level situation, which comes alone later doing practise alongside a right laid of questions. Since these questions are already tried as well as tested as well as appeared inward many interviews, they volition supply y'all the sense y'all demand to cleft your coding interview.
Influenza A virus subtype H5N1 string is i of the most pop information structure, in all likelihood side yesteryear side to the array as well as that's why y'all volition honor at to the lowest degree i query from String inward whatever programming chore interview. If y'all don't know, String is naught but a grapheme array inward most of the linguistic communication similar C. But, inward Java, String is an object, which holds information inward grapheme array.
This agency y'all tin solve many String based occupation yesteryear assuming it equally a grapheme array. You tin purpose all the tips as well as tricks y'all learned yesteryear solving array based coding query to too solve String e.g. reversing a String is the same equally reversing an array as well as thence on.
I possess got too provided the links to solutions for most of the questions thence that y'all tin chop-chop cheque your answer as well as code. Remember, it's non merely of import to solve the occupation but too to sympathise the solution as well as meliorate it gradually.
In a existent interview, an interviewer is equally much interested inward the solution equally on improvement as well as optimization. In lodge to meliorate the solution, adept noesis of information construction is mandatory because inward many cases a choice of adept information construction non alone brand the solution elementary but too fast. For example, yesteryear using a laid y'all tin chop-chop figure out duplicate characters of String.
Also, y'all should survive able to calculate the toll of your solution e.g. fourth dimension as well as infinite complexity on Big O notation. If y'all haven't revise your information construction as well as algorithms then Data Structures as well as Algorithms: Deep Dive Using Java is a adept course of teaching to start alongside earlier y'all acquire for the interview.
1) How to honor the maximum occurring grapheme inward given String? (solution)
Write an efficient Java/C/Python computer program to render the maximum occurring grapheme inward the input string e.g., if the input string is "Java" as well as thence the business office should render 'a'.
2) How to take all duplicates from a given string? (solution)
Write a computer program to take all the duplicate characters from a given input String e.g. if given String is "Java" as well as thence output should survive "Java". The minute or farther occurrence of duplicate should survive removed.
3) How to impress the duplicate characters from the given String? (solution)
Write an efficient Java/C/Python/Ruby computer program to render the duplicate characters from given String, for representative if given String is "C++" as well as thence your computer program should impress "+" Similarly, if input is "Java as well as JavaScript" as well as thence your computer program should impress "J", "a" as well as "v". You tin ignore instance for finding duplicates.
4) How to take characters from the kickoff String which are acquaint inward the minute String? (solution)
Write an efficient Java/c/Python business office that takes ii strings equally arguments as well as removes the characters from the kickoff string which are acquaint inward the minute string. For example, if the kickoff String "India is great" as well as minute String is "in" as well as thence output should survive "da sec great"
5) How to cheque if ii strings are rotations of each other? (solution)
Write an efficient computer program to assay if ii given String is a rotation of each other or non e.g. if given String is "XYZ" as well as "ZXY" as well as thence your business office should render truthful but if the input is "XYZ" as well as "YXZ" as well as thence render false.
6) How to contrary a given String? (solution)
Write a computer program to contrary a String inward C/Java/Python or choice of your programming language. You tin write either the recursive or iterative solution. For example, if a given input is "abcd" as well as thence your business office should render "dcba".
7) How to contrary String without recursion? (solution)
Same equally the previous computer program but y'all cannot purpose recursion, this time, y'all must solve this occupation inward C/Java/Python using iteration or loops. If y'all are non familiar alongside recursion as well as iteration, y'all tin farther cheque the solution)
Write an efficient computer program to impress all permutations of a given String inward Java/C/Python or whatever programming linguistic communication of your choice. For example, if given input is "123" as well as thence your computer program should impress all six permutations e.g. "123", "132", "213", "231", "312" as well as "321".
9) How to honor the kickoff non-repeating grapheme inward a given String? (solution)
Write a computer program inward whatever programming linguistic communication y'all to honor the kickoff non-repeated grapheme inward a given String, for example, if given String is "Java" as well as thence kickoff non-repeated grapheme is "J"
10) How to contrary the words inward a given String sentence? (solution)
Write an efficient computer program inward Java or C++ to contrary the words inward a given String sentence. For example, if the input is "Java is best" as well as thence your computer program should impress "best is Java". There is no restriction on preserving white space.
11) How to honor the smallest substring inward a given string containing all characters of unopen to other string? (solution)
Write an efficient business office inward C/C++ or Java to impress the smallest substring inward a given String containing all characters of unopen to other String. For example, if given String is "this is a assay string" as well as "tist", as well as thence output should survive "t stri".
12) How to cheque if ii given String is the anagram of each other? (solution)
Write an efficient computer program inward Java/C/C++ to cheque if ii String is an anagram of each other. An anagram contains are of the same length as well as contains the same grapheme but inward the dissimilar lodge for representative "Army" as well as "Mary" is the anagram. Your computer program should render truthful if both Strings are the anagram, imitation otherwise
13) How create y'all cheque if a given String is Palindrome or not? (solution)
Write an efficient computer program inward your favorite programming linguistic communication to cheque if a Given a string is a palindrome, considering alone alphanumeric characters as well as ignoring cases. For example,"121" is a palindrome, but "123" is not. Your business office should render truthful if given String is a palindrome, imitation otherwise
14) How create y'all convert String to integer? (solution)
Implement atoi() similar business office inward C/C++/Java to convert a string to an integer. Consider all possible cases e.g. positive as well as negative String, the presence of + or - grapheme etc. For example, if given input String is "123" as well as thence your computer program should render 123 as well as if a given input is "+231" as well as thence your computer program should render 231. I kickoff learned nearly this occupation on Programming Interviews Exposed: Secrets to Landing Your Next Job, i of the finest majority on interviews as well as even thence its explanation is best I possess got read thence far.
15) How create y'all convert a Roman numeral String to Integer inward Java? (solution)
Write a business office inward your favorite programming linguistic communication to convert a given Roman numeral to equivalent String. For example, if given String is "X" as well as thence your computer program should impress 10. Input volition survive inside the hit from 1 to 2000. You tin too ignore instance e.g. both "x" as well as "X" should render 10
17) How create y'all take a given grapheme from String? (solution)
Write an efficient method inward Java to take all occurrence of a given grapheme inward Java. For example, if given String is "Programming" as well as given grapheme to take is "m" as well as thence your business office should render "Prograing".
18) How create y'all count a lay out of words inward String? (solution)
Write a computer program to count a lay out of words inward a given String. The words are separated yesteryear the next characters: infinite (‘ ‘) or newline (‘\n’) or tab (‘\t’) or a combination of these. For example, if input "Java is great" your computer program should impress 3.
19) How create y'all cheque if a given String contains valid parentheses? (solution)
Given a string containing merely the characters '(', ')', '{', '}', '[' as well as ']', write a business office inward Java or C++ to cheque if the input string is valid. The brackets must unopen inward the right order, "()" as well as "()[]{}" are all valid but "(]" as well as "([)]" are not
20) How to convert Integer to Roman String? (solution)
This is the contrary of occupation 17, In this problem, y'all demand to write a business office inward Java/C or C++ to convert a given integer into an equivalent Roman numeral. For example, if a given integer is five as well as thence your computer program should impress "V".
Here is a nautical chart of Roman numerals for 1 to 100 for your reference:
21) How create y'all honor the longest palindromic substring of a given substring? (solution)
Given a string S, honor the longest palindromic substring inward S. You may assume that the maximum length of south is 1000, as well as at that spot exists i unique longest palindromic substring.
That's all nearly unopen to frequently asked String Programming interview questions for preparing Programming Job interviews. The string is a really of import topic thence leave of absence it at your peril. You mightiness possess got seen this query earlier but solving them over again as well as agreement their functioning volition attention y'all a lot inward doing good inward programming interviews.
Further Learning
Data Structures as well as Algorithms: Deep Dive Using Java
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Thanks for reading this article thence far. If y'all similar this article as well as thence delight portion alongside your friends as well as colleagues. If y'all possess got whatever questions or feedback as well as thence delight driblet a note.
P. S. - If y'all are looking for a FREE course of teaching to acquire Data Structure from scratch, y'all tin too cheque out the Easy to Advanced Data Structures course of teaching on Udemy. Influenza A virus subtype H5N1 consummate guide to learning everything at that spot is to know nearly information structures yesteryear William Fiset, a Software engineer at Google as well as ACM-ICPC footing finalist
Influenza A virus subtype H5N1 string is i of the most pop information structure, in all likelihood side yesteryear side to the array as well as that's why y'all volition honor at to the lowest degree i query from String inward whatever programming chore interview. If y'all don't know, String is naught but a grapheme array inward most of the linguistic communication similar C. But, inward Java, String is an object, which holds information inward grapheme array.
This agency y'all tin solve many String based occupation yesteryear assuming it equally a grapheme array. You tin purpose all the tips as well as tricks y'all learned yesteryear solving array based coding query to too solve String e.g. reversing a String is the same equally reversing an array as well as thence on.
I possess got too provided the links to solutions for most of the questions thence that y'all tin chop-chop cheque your answer as well as code. Remember, it's non merely of import to solve the occupation but too to sympathise the solution as well as meliorate it gradually.
In a existent interview, an interviewer is equally much interested inward the solution equally on improvement as well as optimization. In lodge to meliorate the solution, adept noesis of information construction is mandatory because inward many cases a choice of adept information construction non alone brand the solution elementary but too fast. For example, yesteryear using a laid y'all tin chop-chop figure out duplicate characters of String.
Also, y'all should survive able to calculate the toll of your solution e.g. fourth dimension as well as infinite complexity on Big O notation. If y'all haven't revise your information construction as well as algorithms then Data Structures as well as Algorithms: Deep Dive Using Java is a adept course of teaching to start alongside earlier y'all acquire for the interview.
String Programming as well as Coding Interview Questions
Here are 21 most often asked String based questions from a Programming chore interview. These questions are non based on theoretical concept e.g. Why String is Immutable inward Java but rather based upon the string information construction as well as require a lot of coding practise to solve them inward express time.1) How to honor the maximum occurring grapheme inward given String? (solution)
Write an efficient Java/C/Python computer program to render the maximum occurring grapheme inward the input string e.g., if the input string is "Java" as well as thence the business office should render 'a'.
2) How to take all duplicates from a given string? (solution)
Write a computer program to take all the duplicate characters from a given input String e.g. if given String is "Java" as well as thence output should survive "Java". The minute or farther occurrence of duplicate should survive removed.
3) How to impress the duplicate characters from the given String? (solution)
Write an efficient Java/C/Python/Ruby computer program to render the duplicate characters from given String, for representative if given String is "C++" as well as thence your computer program should impress "+" Similarly, if input is "Java as well as JavaScript" as well as thence your computer program should impress "J", "a" as well as "v". You tin ignore instance for finding duplicates.
4) How to take characters from the kickoff String which are acquaint inward the minute String? (solution)
Write an efficient Java/c/Python business office that takes ii strings equally arguments as well as removes the characters from the kickoff string which are acquaint inward the minute string. For example, if the kickoff String "India is great" as well as minute String is "in" as well as thence output should survive "da sec great"
5) How to cheque if ii strings are rotations of each other? (solution)
Write an efficient computer program to assay if ii given String is a rotation of each other or non e.g. if given String is "XYZ" as well as "ZXY" as well as thence your business office should render truthful but if the input is "XYZ" as well as "YXZ" as well as thence render false.
6) How to contrary a given String? (solution)
Write a computer program to contrary a String inward C/Java/Python or choice of your programming language. You tin write either the recursive or iterative solution. For example, if a given input is "abcd" as well as thence your business office should render "dcba".
7) How to contrary String without recursion? (solution)
Same equally the previous computer program but y'all cannot purpose recursion, this time, y'all must solve this occupation inward C/Java/Python using iteration or loops. If y'all are non familiar alongside recursion as well as iteration, y'all tin farther cheque the solution)
Write an efficient computer program to impress all permutations of a given String inward Java/C/Python or whatever programming linguistic communication of your choice. For example, if given input is "123" as well as thence your computer program should impress all six permutations e.g. "123", "132", "213", "231", "312" as well as "321".
9) How to honor the kickoff non-repeating grapheme inward a given String? (solution)
Write a computer program inward whatever programming linguistic communication y'all to honor the kickoff non-repeated grapheme inward a given String, for example, if given String is "Java" as well as thence kickoff non-repeated grapheme is "J"
10) How to contrary the words inward a given String sentence? (solution)
Write an efficient computer program inward Java or C++ to contrary the words inward a given String sentence. For example, if the input is "Java is best" as well as thence your computer program should impress "best is Java". There is no restriction on preserving white space.
11) How to honor the smallest substring inward a given string containing all characters of unopen to other string? (solution)
Write an efficient business office inward C/C++ or Java to impress the smallest substring inward a given String containing all characters of unopen to other String. For example, if given String is "this is a assay string" as well as "tist", as well as thence output should survive "t stri".
12) How to cheque if ii given String is the anagram of each other? (solution)
Write an efficient computer program inward Java/C/C++ to cheque if ii String is an anagram of each other. An anagram contains are of the same length as well as contains the same grapheme but inward the dissimilar lodge for representative "Army" as well as "Mary" is the anagram. Your computer program should render truthful if both Strings are the anagram, imitation otherwise
13) How create y'all cheque if a given String is Palindrome or not? (solution)
Write an efficient computer program inward your favorite programming linguistic communication to cheque if a Given a string is a palindrome, considering alone alphanumeric characters as well as ignoring cases. For example,"121" is a palindrome, but "123" is not. Your business office should render truthful if given String is a palindrome, imitation otherwise
14) How create y'all convert String to integer? (solution)
Implement atoi() similar business office inward C/C++/Java to convert a string to an integer. Consider all possible cases e.g. positive as well as negative String, the presence of + or - grapheme etc. For example, if given input String is "123" as well as thence your computer program should render 123 as well as if a given input is "+231" as well as thence your computer program should render 231. I kickoff learned nearly this occupation on Programming Interviews Exposed: Secrets to Landing Your Next Job, i of the finest majority on interviews as well as even thence its explanation is best I possess got read thence far.
15) How create y'all convert a Roman numeral String to Integer inward Java? (solution)
Write a business office inward your favorite programming linguistic communication to convert a given Roman numeral to equivalent String. For example, if given String is "X" as well as thence your computer program should impress 10. Input volition survive inside the hit from 1 to 2000. You tin too ignore instance e.g. both "x" as well as "X" should render 10
17) How create y'all take a given grapheme from String? (solution)
Write an efficient method inward Java to take all occurrence of a given grapheme inward Java. For example, if given String is "Programming" as well as given grapheme to take is "m" as well as thence your business office should render "Prograing".
18) How create y'all count a lay out of words inward String? (solution)
Write a computer program to count a lay out of words inward a given String. The words are separated yesteryear the next characters: infinite (‘ ‘) or newline (‘\n’) or tab (‘\t’) or a combination of these. For example, if input "Java is great" your computer program should impress 3.
19) How create y'all cheque if a given String contains valid parentheses? (solution)
Given a string containing merely the characters '(', ')', '{', '}', '[' as well as ']', write a business office inward Java or C++ to cheque if the input string is valid. The brackets must unopen inward the right order, "()" as well as "()[]{}" are all valid but "(]" as well as "([)]" are not
20) How to convert Integer to Roman String? (solution)
This is the contrary of occupation 17, In this problem, y'all demand to write a business office inward Java/C or C++ to convert a given integer into an equivalent Roman numeral. For example, if a given integer is five as well as thence your computer program should impress "V".
Here is a nautical chart of Roman numerals for 1 to 100 for your reference:
21) How create y'all honor the longest palindromic substring of a given substring? (solution)
Given a string S, honor the longest palindromic substring inward S. You may assume that the maximum length of south is 1000, as well as at that spot exists i unique longest palindromic substring.
That's all nearly unopen to frequently asked String Programming interview questions for preparing Programming Job interviews. The string is a really of import topic thence leave of absence it at your peril. You mightiness possess got seen this query earlier but solving them over again as well as agreement their functioning volition attention y'all a lot inward doing good inward programming interviews.
Further Learning
Data Structures as well as Algorithms: Deep Dive Using Java
questions)
Thanks for reading this article thence far. If y'all similar this article as well as thence delight portion alongside your friends as well as colleagues. If y'all possess got whatever questions or feedback as well as thence delight driblet a note.
P. S. - If y'all are looking for a FREE course of teaching to acquire Data Structure from scratch, y'all tin too cheque out the Easy to Advanced Data Structures course of teaching on Udemy. Influenza A virus subtype H5N1 consummate guide to learning everything at that spot is to know nearly information structures yesteryear William Fiset, a Software engineer at Google as well as ACM-ICPC footing finalist
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