In this problem, we need to find the sum of all prefixes of the given string. The best solution approach is that traverse through each prefix of the string and add them to get the answer. Problem statement - We have given a string named num_Str containing N digits. We need to find the sum of all prefixes of the given string. Sample examples Input num_str = "1123" Output 1247 Explanation - All prefixes of the given strings are 1, 11, 112, and 1123. The sum of all prefixes is 1247. Input num_str = ... Read More

In this problem, we need to convert the given binary string to abababab or aabbaabb format and find the minimum cost for that. Also, we have given the cost to flip any character in the operations array. Problem statement - We have given a bin_str binary string and operations array containing the positive integers. The size of the string and array is the same and even. The task is to find the minimum costs to convert the string in the ababab… or aabbaabb… format. The cost to flip any character in the given string is the value at the ... Read More

In this problem, we need to find the maximum length of the resultant string by appending the array strings to it such that if we choose a string of length x, we can choose the next x/2 strings. We can solve the programming using the recursive function, memoization, and dynamic programming approach. Problem statement - We have given an array of strings named str_array containing the N strings. We need to add the strings given in the array and find the maximum size of the resultant string. While appending the string to the resultant string, we need to ... Read More

In this problem, we need to find the maximum difference between the indices of the subsequence present in the given string. To solve the problem, we need to find the indices of the subsequence in the actual and reverse order. After that, we need to take the difference of both. Problem statement - We have given two strings named 'str' and 'sub'. The 'sub' string is always present in the 'str' string as a subsequence. We need to find the maximum index cost. The index cost is the difference between two indices of the subsequence. ... Read More

In this problem, we need to remove the maximum characters from the string if the adjacent character is the previous character. We can find the occurrence of each character and check whether any of its adjacent characters is a previous character, we can remove the particular character. Problem statement - We have given a string containing the N alphabetic characters. The given task is we need to remove the maximum number of characters, and we can remove any character of the string if any adjacent character is the previous character in the alphabet. At last, print the count ... Read More

In this problem, we will find the suffix array of the given string. We can sort all the string's suffixes using their first character, as the input string contains different characters. Problem statement - We have given a string containing the different alphabetical characters, and we need to find the suffix array of the given string. The suffix array of the string is a sorted array containing all suffixes of the given string. Sample examples Input str = "point"; Output 2 3 1 0 4 Explanation All suffixes of the string ... Read More

In this problem, we need to count digits frequencies after merging the ASCII values of all characters. The approach to solving the problem is to create a string containing each character's ASCII values and count the frequency of the digits in the string. Problem statement - We have a string alpha containing different characters, and the length of the string is N. We need to calculate each digit's frequency after concatenating the ASCII values of the given string's characters. Sample examples Input alpha = "tutorialspoint" Output 4 25 1 0 1 3 3 2 1 1 ... Read More

In this problem, we need to prepare a set of unique substrings of the given binary string and remove them from the set if it contains an even number of 1s and its reverse also exits in the set. We can solve the problem using two ways. The first way is to find all substrings of the given binary string, check if any substring contains an even number of 1's and its reverse exits, and remove the reverse string from the set. Another way is by comparing the total number of parity bits in the given string. ... Read More

In this problem, we need to encode the string in xAyB format, where x is the count of digits present in both strings at the same index, and y is the count of digits in both strings at different indices. We can solve the problem by counting the same digits in both strings. Also, we can count the total number of the same digits present at same index in both strings to encode the string. Problem statement - We have given str1 and str2 strings of the same length containing only digits. We need to encode the given ... Read More

In this problem, we need to calculate the distance between the character and 'a', and by adding it to the character, we need to shift the character. The solution approach is to find the difference between the ASCII values of both characters, and add it to the current character's ASCII value. Problem statement - We have given an alpha string of length N containing only alphabetical characters. We need to encode the string according to the below conditions. Take a distance between the current character and 'a'. ... Read More