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[ { "content": "Make a function \"convert_time\" that would convert seconds to minutes, hours, and days. The function should only accept positive integer values for the seconds parameter. Additionally, the function should check if the converted time is within a specific range, such as not exceeding 48 hours or 14...
codefeedback
[ { "content": "Implement a function to print the Fibonacci series up to the nth term, but also print the sum of the prime numbers in the series. Additionally, ensure that the function is optimized to have a time complexity of O(n) and a space complexity of O(1).", "role": "user" }, { "content": "To i...
codefeedback
[ { "content": "Write a Python program to print all possible combinations of the given list, where each combination consists of a different number of elements from the original list, and the elements in each combination are in ascending order. Additionally, ensure that the program does not include any duplicate c...
codefeedback
[ { "content": "Create a frequency chart that tracks the occurrence of each unique word in a given text document. The frequency chart should be implemented using a dictionary data structure in Python. Additionally, optimize the solution to have a time complexity of O(n), where n is the length of the text document...
codefeedback
[ { "content": "Create a function \"avg_grade\" that takes a list of grades and returns the average of the grades, but with a time complexity of O(1) and without using any built-in functions or libraries. The grades in the list will always be integers ranging from 0 to 100. Additionally, the function should handl...
codefeedback
[ { "content": "Please write a function to determine if the sum of two given numbers is within a given range. The range is defined by a starting and ending number.\n\nThe function should meet the following criteria:\n1. It should have a time complexity of O(1) and a space complexity of O(1).\n2. You are not allow...
codefeedback
[ { "content": "Identify the error in the following function:\nReplace all uppercase letters in a string with a given character and count the number of replacements made, but do not use any built-in string methods. Additionally, the function should only replace uppercase letters that are followed by a lowercase l...
codefeedback
[ { "content": "Create a function that increments a given number by a specified amount, but the function should only use bitwise operations and cannot use any arithmetic operations. Additionally, the function should have a time complexity of O(1) and should not use any loops or conditional statements.\n\n#Example...
codefeedback
[ { "content": "Create a Python function that takes a matrix of numbers as input and returns a list of the top k rows with the highest sum of absolute differences between consecutive elements. The function should handle missing values (None) in the matrix and exclude them from the calculations. The function shoul...
codefeedback
[ { "content": "Write a function that takes in a list and an item, and adds the item to the end of the list. However, if the list is empty, display an error message. \n\nAdditionally, the function should check if the item is already present in the list before adding it. If the item is already in the list, display...
codefeedback
[ { "content": "Write a function that generates a dictionary mapping each Keytype with a description of \"What it is\". The Keytype can be any string consisting of letters, numbers, and special characters. The function should also handle the case where multiple Keytypes have the same description. Additionally, th...
codefeedback
[ { "content": "Please update the given function `reverse_string` to reverse the input string `s` without using any built-in functions or methods that directly reverse the string. The solution should have a time complexity of O(n) and reverse the string in-place without using any additional data structures. The s...
codefeedback
[ { "content": "Convert the following nested JSON object to a .csv table. Make sure to handle the nested structure correctly.\n\nJSON object:\n{\n \"name\": \"John Doe\",\n \"age\": 35,\n \"job\": \"Software Engineer\",\n \"address\": {\n \"street\": \"123 Main St\",\n \"city\": \"San Francisco\",\n ...
codefeedback
[ { "content": "Create a content aggregator application in Python that only aggregates and displays content from a specific set of RSS feeds related to a niche industry. The application should have a user authentication system where users can create an account and login to access the aggregated content. Users sho...
codefeedback
[ { "content": "Compose a python function to find the maximum element in a 2-dimensional array, but the array can contain negative numbers as well. Additionally, the function should only consider the maximum element within each row, and return a list of the maximum elements for each row. However, the function sho...
codefeedback
[ { "content": "Write a script in Python that will find the average of a list of numbers. However, the list may contain both integers and strings. Your script should handle this situation by excluding any strings from the calculation and considering only the numbers in the list. The script should also handle case...
codefeedback
[ { "content": "Code a function that takes a list of strings and checks if it is ordered lexicographically in reverse order, considering only the last two characters of each string. If a string has less than two characters, it should be considered as 'zz'. The function should have a time complexity of O(nlogn), w...
codefeedback
[ { "content": "Reverse a string in place, but without using any additional data structures or built-in functions. The string should be reversed in groups of 3 characters, and the characters within each group should be reversed as well. The input string will always contain a multiple of 3 characters.", "role"...
codefeedback
[ { "content": "Suggest a completion for the following code to check if the given string is a palindrome. The solution should not use any built-in string manipulation functions and should also have a time complexity of O(n), where n is the length of the string. The solution should be implemented recursively inste...
codefeedback
[ { "content": "Write a function that takes two non-negative integers as input and returns their product. However, you are not allowed to use the multiplication operator (*) or any built-in multiplication functions in your solution. Additionally, you are not allowed to use any loops or recursion in your solution....
codefeedback
[ { "content": "Increase the difficulty by adding more complex logic and additional requirements to the rewritten test question.\n\nRewrite the find_max function to handle negative numbers differently and also find the second maximum value in the list.\n\n# Original Problem #\nTransform the following Python funct...
codefeedback
[ { "content": "Implement the quicksort algorithm for a circular doubly linked list. However, you are not allowed to use any additional data structures or modify the original linked list. You can only swap the values of the nodes. Additionally, you must ensure that the algorithm has a time complexity of O(n log n...
codefeedback
[ { "content": "Write a python program to filter a list of numbers to only include numbers that are divisible by both 3 and 5, and sort them in descending order. The program should also calculate and display the product of all the numbers in the filtered list. The program should handle cases where the input list ...
codefeedback
[ { "content": "Write an efficient algorithm to detect the longest common subsequence of two given strings. The algorithm should have a time complexity of O(n*m), where n and m are the lengths of the input strings, respectively. The algorithm should also handle cases where the input strings contain special charac...
codefeedback
[ { "content": "Write a Python function that implements the quicksort algorithm to sort an array of integers in ascending order. Your function should take in an array as input and return the sorted array. Include the necessary steps involved in partitioning the array and choosing the pivot element.\n\nIn your sol...
codefeedback
[ { "content": "Using the given list, create a code that will generate a unique list of numbers, while also ensuring that the code has a time complexity of O(n) and a space complexity of O(1). Additionally, the code should only use bitwise operations and cannot use any arithmetic or comparison operators.\n\nTo in...
codefeedback
[ { "content": "Describe the functionality and use cases of a stack and a queue. Compare and contrast the data structures in terms of their operations, properties, and applications. Additionally, provide a detailed implementation of a program in any programming language that solves a specific problem using a stac...
codefeedback
[ { "content": "Given a JSON string, write a program to convert it into an equivalent XML string. The JSON string will contain nested objects and arrays. The program should handle any valid JSON input, including complex nested structures and large data sets.\n\n#Example Input#\n{\"employees\":[{\"firstName\":\"Jo...
codefeedback
[ { "content": "Code a Python algorithm to reverse a given string while ignoring any non-alphabetic characters, preserving the original capitalization, and ensuring that no two consecutive alphabetic characters are the same. Additionally, the algorithm should only use a single line of code and should not utilize ...
codefeedback
[ { "content": "Given a data set, normalize the values by dividing each value by the sum of all values in the set. Remove any negative values and sort the resulting list in descending order. Additionally, the input list should be sorted in ascending order before performing any other operations. \nInput: [1000, 75...
codefeedback
[ { "content": "Create a function in Python that takes three parameters and calculates the Employee Bonus depending on the hours worked, hourly rate, and employee's performance rating. The function should also check if the hours worked is within the valid range of 0 to 40 and if the hourly_rate is a positive numb...
codefeedback
[ { "content": "Make a function that accepts an array of numbers and returns the second largest number without using any built-in sorting or maximum/minimum finding functions or methods. The function should have a time complexity of O(n) and a space complexity of O(1).", "role": "user" }, { "content":...
codefeedback
[ { "content": "Find the sum of all the even Fibonacci numbers less than 1 billion, using an iterative approach and without using any additional data structures to store the Fibonacci sequence.", "role": "user" }, { "content": "To find the sum of all the even Fibonacci numbers less than 1 billion usin...
codefeedback
[ { "content": "Create a function that takes in two inputs, m and n, where m is the starting number and n is the number of terms in the Fibonacci series. The function should return the Fibonacci series starting from m and containing n terms. Additionally, the function should check if m and n are positive integers...
codefeedback
[ { "content": "Write a program that compares two strings and outputs the number of characters that are different between the two strings. Additionally, the program should provide the positions of the differing characters within the strings. The program should consider uppercase and lowercase characters as differ...
codefeedback
[ { "content": "Write a Python program to check if a string contains at least five consecutive special characters, where special characters are defined as any character that is not a letter or a number. The program should be case-sensitive, handle strings of any length, and return a boolean value indicating wheth...
codefeedback
[ { "content": "You are given an array of strings. Write a Python script to sort the array in alphabetical order. However, you are not allowed to use any built-in sorting functions or methods, and you must implement a bubble sort algorithm. Additionally, your implementation should have a time complexity of O(n^2)...
codefeedback
[ { "content": "You are given an array of integers. Create a function to check if the array contains any duplicate values. If duplicate values are found, return the indices of all the duplicate values found. If no duplicate values are found, return an empty array.\n\nYour function should have a time complexity of...
codefeedback
[ { "content": "Create a program to remove all duplicate elements from a list and return the number of unique elements remaining in the list. Your program should also maintain the order of the original list while removing the duplicates. Additionally, your program should have a time complexity of O(n) and space c...
codefeedback
[ { "content": "Create a recursive function that accepts a string and prints out each word with the count of its characters. The function should ignore any special characters or numbers and only consider the words. It should also handle cases where the string contains leading or trailing spaces. The function shou...
codefeedback
[ { "content": "Compute the maximum value of a List in Python without using the built-in max() function. Additionally, ensure that the list may contain negative numbers. Implement the solution using recursion.", "role": "user" }, { "content": "To find the maximum value of a list using recursion in Pyt...
codefeedback
[ { "content": "Create a program that extracts the first and last names from a string and ensures that the first name starts with an uppercase letter and the last name starts with a lowercase letter. The program should also handle cases where the input string contains middle names or multiple spaces between names...
codefeedback
[ { "content": "Given a JSON object, output an object with keys sorted in descending order based on the length of the key. If two keys have the same length, sort them alphabetically. If two keys have the same length and alphabetical order, sort them based on the number of vowels in the key. If two keys have the s...
codefeedback
[ { "content": "Given a list of integers, find the mean, median, mode, and range of the array, and also determine the standard deviation. The input array will have at least 5 elements.", "role": "user" }, { "content": "To find the mean, add up all the elements in the array and divide by the number of ...
codefeedback
[ { "content": "Create a loop to delete all elements in a doubly linked list, but also ensure that the loop is efficient and does not have a time complexity higher than O(n), where n is the number of elements in the doubly linked list. Additionally, you must implement the doubly linked list using a circular doubl...
codefeedback
[ { "content": "Construct an array of N elements from a given string, where N is the length of the string. Each element in the array should only contain unique characters. If any character is repeated in the string, it should be ignored and not included in the array.\n\nString: \"programming is fun and challengin...
codefeedback
[ { "content": "Please implement the Quick Sort algorithm in Python.\n\n## Requirements:\n- The time complexity of the solution should be O(n log n), where n is the length of the input list.\n- The space complexity of the solution should be O(log n), i.e., the solution should use recursion to sort the list.\n- Th...
codefeedback
[ { "content": "Compute the Shannon entropy of a given probability distribution, where the probability distribution is represented by a dictionary with variable-length keys.\n\nDistribution: {'a': 0.15, 'b': 0.35, 'c': 0.5}\n\nHandle the case where the probability distribution is not valid, i.e., the probabilitie...
codefeedback
[ { "content": "Generate a Python code to convert a list of strings to a list of integers. The code should handle situations where the input list contains both integers and non-integer strings. Any non-integer strings should be skipped and not included in the final list of integers. The converted list should be s...
codefeedback
[ { "content": "Write a program to count the number of occurrences of each vowel (a, e, i, o, u) in the given string, while also considering uppercase letters as vowels. The string may contain special characters and punctuation marks. Additionally, the program should also keep track of the number of consonants an...
codefeedback
[ { "content": "Please create a Python code that takes in two strings and finds all common characters from the strings. The code should handle cases where there are multiple occurrences of a character in a string and should return a dictionary where the keys are the common characters and the values are the number...
codefeedback
[ { "content": "You need to create a Python function to detect if a given number is prime or not. However, you are not allowed to use any built-in functions or libraries to check for prime numbers. You must implement the prime-checking logic from scratch using only basic programming constructs.\n\nIn addition to ...
codefeedback
[ { "content": "You need to create a Python function to remove duplicate elements from a given list while maintaining the original order of elements. The function should return the updated list.\n\n# Constraints and Requirements\n1. The function should have a time complexity of O(n^3), where n is the length of th...
codefeedback
[ { "content": "Write a function that takes in a positive integer N as input and returns a list of all prime numbers from 1 to N. The function should have a time complexity of O(N√N).\n\nHowever, in this version, you are not allowed to use any built-in functions or libraries that directly solve this problem. You ...
codefeedback
[ { "content": "You need to create a Python class to represent a 3-dimensional point. The class should have the following methods:\n\n1. A method to set the coordinates of the point.\n2. A method to calculate the distance between two points in 3D space.\n3. A method to calculate the angle between two vectors form...
codefeedback
[ { "content": "Help debug this code snippet by adding comments with the appropriate error messages. \n\nAdd the following constraints: \n1. The name should not be empty. \n2. The name should only contain alphabets. \n3. The length of the name should be at most 10 characters.\n4. The name should start with an upp...
codefeedback
[ { "content": "Create a Python code to find all uncommon characters between two strings, ensuring that the code can handle strings of up to 1000 characters in length. The code should also be optimized to find the uncommon characters in O(n) time complexity, where n is the length of the longer string.\n\nProvide ...
codefeedback
[ { "content": "You need to write a Python function that finds all unique substrings of a given string in order, and returns them as a list. The function should have the following signature:\n\ndef find_unique_substrings(string: str) -> List[str]:\n\nThe function should return a list of all unique substrings of t...
codefeedback
[ { "content": "Create a Python function to sort a list of strings based on a given alphabetical order. The alphabetical order is defined by a dictionary where each letter is associated with a unique integer value. The strings in the list can contain any printable ASCII characters.\n\nThe sorting should be perfor...
codefeedback
[ { "content": "Construct a function to output the product of two numbers. Additionally, handle the case where one or both of the input numbers are negative. However, you should not use the multiplication operator (*) or any built-in multiplication functions. Implement the function using only bitwise operations, ...
codefeedback
[ { "content": "Given a string, find the longest palindrome within it that starts and ends with the same letter. The length of the string will not exceed 10^6 characters. You need to optimize your solution to have a time complexity of O(n) and space complexity of O(1). The string may contain any printable ASCII c...
codefeedback
[ { "content": "Construct the following JSON object:\n\n```json\n{\n \"name\": \"John Doe\",\n \"age\": 25,\n \"email\": \"johndoe@example.com\",\n \"address\": {\n \"street\": \"123 Main Street\",\n \"city\": \"New York\",\n \"state\": \"NY\",\n \"zipcode\": \"10001\"\n },\n \"hobbies\": [\"rea...
codefeedback
[ { "content": "Create a function that takes a specific input and produces a specific output using only addition and subtraction operators. The function must also satisfy the following constraints: the input must be a positive integer between 1 and 1000, and the output must be a negative integer between -1000 and...
codefeedback
[ { "content": "Create a function that generates a series of Fibonacci numbers up to a certain number of items. The function should also calculate the sum of all the prime Fibonacci numbers in the series. Additionally, the function should check if the sum is a palindrome and return the smallest prime palindrome n...
codefeedback
[ { "content": "Construct a function to convert feet to meters, but the function should only accept floating-point numbers as input and should return the result with a precision of up to 5 decimal places. Additionally, handle the case where the input is a negative number and return the result as a positive value....
codefeedback
[ { "content": "Create a function to capitalize all the words of a sentence, while also reversing the order of the words in the sentence. The function should have a time complexity of O(n) and should not use any built-in string manipulation functions or regular expressions. Additionally, the function should use c...
codefeedback
[ { "content": "Write a function called \"print_characters\" that takes a string as input and prints each character of the string using a for loop. The function should also count and print the number of vowels in the string. The string may contain uppercase and lowercase letters, numbers, special characters, and ...
codefeedback
[ { "content": "Find the sum of the elements of an array, but only include elements that are divisible by both 2 and 3, are prime numbers, and their sum of digits is also a prime number. \n\narr = [1,2,3,4,6,9,12,13,15,16,18,19,20]", "role": "user" }, { "content": "To find the sum of the elements of t...
codefeedback
[ { "content": "Implement a code that checks if a given sentence is a palindrome, considering all alphanumeric characters and ignoring case sensitivity. The sentence may also contain special characters such as punctuation marks and spaces.\nSentence: \"A man, a plan, a canal, Panama!\"", "role": "user" }, ...
codefeedback
[ { "content": "Write a code for creating an array with values from 0 to n, where each element in the array is a string representation of the corresponding number. The array should only contain prime numbers. Additionally, the code should sort the array in descending order and remove any duplicates.\nn = 15", ...
codefeedback
[ { "content": "Compute the maximum subarray sum for the given array. Find the subarray that has the largest sum, and also has a length greater than or equal to 3. Additionally, the subarray should be non-empty, contiguous, and all its elements should be positive integers. Array: [1, 2, -3, 4, -1, 2, 1, -5, 4, 7]...
codefeedback
[ { "content": "Implement quick sort on an array of strings. The strings will contain only lowercase letters and will have a maximum length of 100 characters. The input array will have a maximum length of 1,000,000. The implementation should be able to handle this worst-case scenario efficiently, with a time comp...
codefeedback
[ { "content": "Provide a code for creating a function which receives an array of integers, sorts them in descending order, and prints the sorted array. However, you are not allowed to use any loops or recursion.\n\nAdditional Requirements:\n1. The code should not use any built-in sorting functions or libraries.\...
codefeedback
[ { "content": "Implement a function called `string_compressor` that takes in a string as input and returns a compressed version of the string using the following rules:\n\n1. The compressed string should consist of repeated characters followed by the count of consecutive occurrences.\n2. If the compressed string...
codefeedback
[ { "content": "Using a while loop, print the first 100 prime numbers that are also palindrome numbers. Additionally, ensure that each prime number is checked for divisibility by all prime numbers smaller than it.", "role": "user" }, { "content": "To solve this problem, we can create two helper functi...
codefeedback
[ { "content": "You are given an array of dictionaries, each representing a task. Each dictionary has the following keys: \"priority\", \"name\", and \"id\". Your task is to order the tasks based on the following conditions:\n\n1. Tasks with a priority of 1 should be placed at the beginning of the list.\n2. Tasks...
codefeedback
[ { "content": "Given a sentence, remove all vowels and return the modified sentence. The sentence may contain punctuation marks, special characters, and multiple spaces between words. Additionally, you need to handle both lowercase and uppercase vowels. Your solution should also consider edge cases where the sen...
codefeedback
[ { "content": "Create a code which prints a multiplication table of a given size.\nThe size should be an odd number between 5 and 15, inclusive.\nThe code should generate the multiplication table using nested loops, without using any built-in multiplication functions or operators.\nThe time complexity of the cod...
codefeedback
[ { "content": "Design a loop in Python to find the maximum value from a given array. The array can contain duplicate elements and can have a maximum length of 10^6. The time complexity of the solution should be O(n), where n is the length of the array.\n\nAdditionally, the array may also contain negative values....
codefeedback
[ { "content": "Find all the prime factors of a given integer, where the integer can be as large as 10^15. Additionally, write a function to check if a given number is a perfect square and provide a reference to the function. \n\n1234567890123456", "role": "user" }, { "content": "To find all the prime...
codefeedback
[ { "content": "Create a Python class to encode a string of characters using a Vigenère cipher. Your implementation should include a method to handle both encryption and decryption. Additionally, the Vigenère cipher should have a variable keyword that can be set by the user. The keyword should be a string of char...
codefeedback
[ { "content": "Can you write a function that returns the sum of the positive even elements of a given array, excluding any elements that are divisible by 3 and are prime numbers? The function should handle both positive and negative integers. Additionally, the function should also exclude any elements that are d...
codefeedback
[ { "content": "How can you reverse a given string using a while loop, without using any built-in string reversal functions? Additionally, you are not allowed to use any additional variables to store the reversed string. \n\nstring = \"hello\"\n\n*Rewritten test with increased difficulty:*\nHow can you reverse a ...
codefeedback
[ { "content": "Generate 5 random prime numbers between 1000 and 10000, such that the sum of the digits of each prime number is a prime number itself. Additionally, the program should check for any duplicate prime numbers and exclude them from the final result.", "role": "user" }, { "content": "Here i...
codefeedback
[ { "content": "How can you fill a 2D array with zeros using a single loop and without using any built-in functions or methods? Additionally, ensure that the array is a jagged array, where each inner array can have a different length. Provide a piece of erroneous code as a reference to increase misdirection.", ...
codefeedback
[ { "content": "Please process the following array of numbers to get the max, min, and average scores. Additionally, find the median score. The scores array may contain duplicate values.\n\nscores = [90, 75, 70, 85, 80, 85, 90, 95]\n\nYou are not allowed to use any built-in sorting functions or libraries. Impleme...
codefeedback
[ { "content": "Find the most frequent value in a list, but the list can also contain strings. Return the most frequent value as a string if it is a string, otherwise return it as an integer. The list can contain up to 10 million elements and each element can have a length of up to 1000 characters.\n\nmylist = [1...
codefeedback
[ { "content": "Define a function to calculate the product of four prime numbers, with the condition that all four prime numbers must be unique and less than 100.", "role": "user" }, { "content": "To calculate the product of four unique prime numbers less than 100, you can define a function that check...
codefeedback
[ { "content": "Explain the concept of method overriding in object-oriented programming and provide an example in Python. Describe the difference between method overriding and method overloading, and discuss when each technique is appropriate to use in a program. Additionally, in your example, demonstrate the use...
codefeedback
[ { "content": "Write a for loop that prints all prime numbers between 1 and 100, but skip the number 55. Additionally, the program should also calculate and print the sum of all the prime numbers.", "role": "user" }, { "content": "```python\n# Initialize variables\nprime_sum = 0\n\n# Iterate through ...
codefeedback
[ { "content": "Given a Python dictionary with integer values, create a function to return the key(s) with the highest frequency in the dictionary. The function should also handle cases where multiple keys have the same highest frequency. If there is a tie for the most common frequency, return a list of all the t...
codefeedback
[ { "content": "Implement a stack data structure in a programming language of your choice. The stack should be able to handle elements of any data type, not just integers. Provide an example code snippet demonstrating the push and pop operations, along with an explanation of how these operations are typically use...
codefeedback
[ { "content": "Given a triangle with any angles and side lengths, write a function to compute its area using the Law of Cosines. Your function should also check if the triangle is valid, meaning that the sum of any two sides must be greater than the third side. If the triangle is not valid, the function should r...
codefeedback
[ { "content": "Find the median of this sequence of positive integers: 4, 3, 7, 10, 9, 6, 2, 1, 8, 5. Additionally, implement a solution that does not use any built-in sorting functions or data structures. Your solution should have a time complexity of O(nlogn) or better.", "role": "user" }, { "conten...
codefeedback
[ { "content": "Write a Python program that prints all prime numbers from 1 to 100000. Additionally, you should also print a message for each number stating whether it is a prime number or not.", "role": "user" }, { "content": "Here's a Python program that prints all prime numbers from 1 to 100000 and...
codefeedback
[ { "content": "Using the given code, implement the function \"add_two_numbers\" which will take two integers, both ranging from -1000 to 1000, and return their sum. You are not allowed to use the \"+\" operator or any built-in functions for addition. Instead, you should implement addition using only bitwise oper...
codefeedback
[ { "content": "Create a function in Python that will take two parameters: a string and an integer, and return the string repeated the amount of times specified by the integer. The function should have a time complexity of O(n), where n is the length of the string, and a space complexity of O(1).\n\nThe function ...
codefeedback
[ { "content": "Write a code to delete the element at a given index in a two-dimensional array, while also shifting all the elements in the same row and column as the deleted element to fill the gap. The array will be represented as a list of lists. The index must be within the bounds of the array, and the code s...
codefeedback
[ { "content": "Using the given code, create a function \"calculate_area\" which will take two integer parameters and calculate the area of a rectangle. The length and width parameters should be positive integers and the function should return the area as a floating-point number. Additionally, the function should...
codefeedback
[ { "content": "Create a custom encryption algorithm to encode a string of characters. The encryption algorithm should not rely on any built-in encryption functions or libraries. Additionally, the algorithm should include a decryption function to decode the encoded string back to its original form. \n\nThe encryp...
codefeedback