Topic: language-problem / Level: intermediate

• 1902. Write a program to check if a number is a Harshad number using its digits.
• 1903. Write a program to implement a basic game of Snake.
• 1904. Write a program to find the smallest prime factor of a number.
• 1905. Write a program to check if a string is a valid Morse code representation.
• 1906. Write a program to find the sum of the first n odd Fibonacci numbers.
• 1907. Write a program to implement a basic library management system with user accounts.
• 1908. Write a program to check if a number is a Fibonacci number using a closed-form expression.
• 1909. Write a program to find the longest palindrome in a string using dynamic programming.
• 1910. Write a program to implement a simple online ticket reservation system.
• 1911. Write a program to check if a string can be rearranged to form a palindrome.
• 1912. Write a program to find the first non-repeating character in a string using a hash table.
• 1913. Write a program to implement a basic online shopping application with inventory management.
• 1914. Write a program to check if two strings are equal using a character-by-character comparison.
• 1915. Write a program to calculate the total cost of items in a shopping cart including taxes.
• 1916. Write a program to implement a simple online feedback collection system.
• 1917. Write a program to check if a number is a prime number using the trial division method.
• 1918. Write a program to find the sum of the digits of a hexadecimal number.
• 1919. Write a program to implement a basic text-based RPG with character stats and abilities.
• 1920. Write a program to check if a string is a valid hexadecimal number.
• 1921. Write a program to find the total number of words in a text using a function.
• 1922. Write a program to implement a basic online event management system.
• 1923. Write a program to check if a number is a perfect square using the square root method.
• 1924. Write a program to find the longest substring of unique characters using a sliding window approach.
• 1925. Write a program to implement a simple online banking system with deposit and withdrawal functions.
• 1926. Write a program to check if a string is a valid time in the format HH
• 1927. Write a program to find the GCD of three numbers using a recursive function.
• 1928. Write a program to implement a simple console-based file management system.
• 1929. Write a program to check if a string is a valid date in the format DD/MM/YYYY.
• 1930. Write a program to find the sum of the first n prime numbers using the Sieve of Eratosthenes.
• 1931. Write a program to implement a basic inventory tracking system.
• 1932. Write a program to check if a number is a perfect number using a function.
• 1933. Write a program to find the first duplicate number in an array.
• 1934. Write a program to implement a simple online restaurant menu.
• 1935. Write a program to check if a string contains balanced parentheses using a stack.
• 1936. Write a program to find the sum of the digits of a number until a single digit is obtained.
• 1937. Write a program to implement a basic task management application with due dates.
• 1938. Write a program to check if a number is a sociable number.
• 1939. Write a program to find the maximum sum of a non-contiguous subarray using dynamic programming.
• 1940. Write a program to implement a simple user registration system with validation.
• 1941. Write a program to check if a string is a valid email address format.
• 1942. Write a program to find the longest palindromic substring using dynamic programming.
• 1943. Write a program to check if two strings can be rearranged to form an anagram.
• 1944. Write a program to implement a basic online recipe sharing platform.
• 1945. Write a program to check if a number is a perfect square using a function.
• 1946. Write a program to find the total number of vowels in a string using a function.
• 1947. Write a program to implement a basic budgeting application that tracks monthly expenses.
• 1948. Write a program to check if a string contains only alphabetic characters.
• 1949. Write a program to find the first non-repeating digit in a string.
• 1950. Write a program to implement a simple console-based note-taking application.
• 1951. Write a program to check if a number is a prime number using the Sieve of Eratosthenes.

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