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Category Archives: Strings

Count alphanumeric palindromes of length N

Given a positive integer N, the task is to find the number of alphanumeric palindromic strings of length N. Since the count of such strings… Read More

Modular Arithmetic

palindrome

permutation

Permutation and Combination

Combinatorial

Mathematical

Strings

Minimum jumps required to make a group of persons sit together

Hard

Given a string S of length N consisting of ‘x’ and ‘.’. The given string represents a row of seats where ‘x’ and ‘.’ represent… Read More

interview-preparation

Check if string S2 can be obtained by appending subsequences of string S1

Hard

Given two strings S1 and S2, the task is to check if it’s possible to generate string S2 by repeatedly appending subsequences of S1 to… Read More

Possible arrangement of persons waiting to sit in a hall

Given an integer N, a binary string S and an array W[]. S denotes the sequence of N * 2 persons entering the hall, where… Read More

Minimize replacements or swapping of same indexed characters required to make two given strings palindromic

Given two strings, str1 and str2 consisting of N lowercase alphabets, the task is to find the minimum count of operations of the following two… Read More

palindrome

Searching

Strings

Lexicographically smallest string formed by removing duplicates

Medium

Given a string S consisting of lowercase alphabets, the task is to find the lexicographically smallest string that can be obtained by removing duplicates from… Read More

frequency-counting

lexicographic-ordering

Greedy

Hash

Strings

Length of the longest substring with every character appearing even number of times

Medium

Given a numerical string S of length N, the task is to find the length of the longest substring of S where each element occurs… Read More

Minimum removal of characters required such that permutation of given string is a palindrome

Given string str consisting of lowercase letters, the task is to find the minimum number of characters to be deleted from the given string such… Read More

Sum of all possible strings obtained by removal of non-empty substrings

Given numerical string str consisting of N integers, the task is to find the sum of all possible resulting strings after removing non-empty substrings. Examples:… Read More

Reduce string by removing outermost parenthesis from each primitive substring

Given a string S of valid parentheses “(“ and “)”, the task is to print the string obtained by removing the outermost parentheses of every… Read More

Check if decimal representation of Binary String is divisible by 9 or not

Hard

Given a binary string S of length N, the task is to check if the decimal representation of the binary string is divisible by 9… Read More

Minimum number of operations required to return to the main folder

Given an array of strings arr[] representing the change folder operations(Unix-style) performed on the file system. Initially, the file system opens in the main folder.… Read More

cpp-stack

interview-preparation

Arrays

Stack

Strings

Count distinct strings possible by replacing each character by its Morse code

Given an array of strings arr[], the task is to count the number of distinct strings that can be generated from the given array by… Read More

cpp-set

frequency-counting

Strings

Program to format a number with thousands separator in C/C++

Given an integer N, the task is to print output of the given integer in international place value format and put commas at the appropriate… Read More