Cryptography Queries for Job Interviews in the Field of String Coding

In the realm of technical interviews, string problems are a common staple, testing an interviewee's fundamental algorithmic skills. These problems come in various levels of difficulty, ranging from easy to hard, with the majority of questions typically falling under easy and medium.

For those starting their interview preparation journey, here's a list of some common string problems categorised by difficulty level:

Easy Problems

Palindrome Check: Determining if a string is the same forwards and backwards.
Reverse a String: Reversing the order of characters in a string.
Reverse Words: Reversing the order of words in a sentence while maintaining the original word order.
Check for Rotation: Determining if one string is a rotation of another.
First Non Repeating: Finding the first character that appears only once in a string.
Roman to Integer: Converting a Roman numeral to an integer.
Implement Atoi: Converting a string to an integer.
Encrypt the String - II: Implementing a character ai substitution cipher.
Equal Point in Brackets: Checking if a string containing brackets has a balanced structure.
Anagram Checking: Determining if two strings have the same characters in a different order.
Pangram Checking: Checking if a string contains every letter of the alphabet at least once.
Validate IP Address: Verifying if a given string is a valid IP address.
Add Binary Strings: Combining two binary strings.

Medium Problems

Integer to Words: Converting an integer to its spoken form.
Fizz Buzz: Generating a sequence of numbers with certain rules (e.g., replacing multiples of 3 with 'Fizz' and multiples of 5 with 'Buzz').
Palindromic Sentence Check: Determining if a sentence is a palindrome (reads the same forwards and backwards).
Isomorphic Strings: Checking if two strings have the same characters in the same relative positions.
Check for k-anagram: Determining if two strings are anagrams of each other (contain the same letters) with a maximum number of letter swaps.
Equal 0,1, and 2: Counting the number of 0s, 1s, and 2s in a binary string.
Find and replace in String: Replacing all occurrences of a substring with another string.
Look and say Pattern: Converting a number to its 'look and say' representation (e.g., 'one 1, two 2s, three 3s').
Minimum repetitions to make Substring: Determining the minimum number of times a substring must be repeated to make a given string.
Excel Sheet - I: Converting an ASCII string to an Excel column.
Find the N-th character: Finding the Nth character in a string.
Next Palindromic Number with same digits: Finding the next palindromic number with the same digits as a given number.
Length of longest prefix suffix: Finding the length of the longest common prefix and suffix of two strings.
Longest K unique characters substring: Finding the longest substring with exactly K unique characters.
Smallest window containing all: Finding the smallest window in a string that contains all characters of another string.
Longest substring without repeating characters: Finding the longest substring without repeating characters in a string.
Substrings of length k with k-1 distinct elements: Counting the number of substrings of a given length with k-1 distinct elements.
Count number of substrings: Counting the number of substrings in a string.
Interleaved Strings: Checking if two strings can be interleaved (alternating characters from each string) to form a third string.
Print Anagrams together: Grouping anagrams together in a list.
Rank the permutation: Ranking a permutation of a string based on its lexicographical order.
A Special Keyboard: Simulating typing on a special keyboard with limited functionality.
Sum of two large numbers: Adding two large numbers represented as strings.

To learn solutions for these problems, consider using coding platforms like LeetCode and educational resources such as freeCodeCamp and GeeksforGeeks, which offer targeted string problem tutorials and practice. Happy coding!