Topic: language-problem / Level: intermediate

• 1752. Write a program to check if a number is an odd prime number.
• 1753. Write a program to find the longest substring of unique characters.
• 1754. Write a program to implement a basic online recipe application.
• 1755. Write a program to check if a string contains any whitespace characters.
• 1756. Write a program to find the sum of all even digits in a number.
• 1757. Write a program to implement a simple quiz application with time limits.
• 1758. Write a program to check if a number is a perfect cube.
• 1759. Write a program to find the first non-repeating digit in a string.
• 1760. Write a program to implement a simple online attendance tracking system.
• 1761. Write a program to check if a string is a valid credit card number using Luhns algorithm.
• 1762. Write a program to find the total number of sentences in a text.
• 1763. Write a program to implement a simple project management tool.
• 1764. Write a program to check if a number is a sociable number.
• 1765. Write a program to find the maximum sum of a contiguous subarray using dynamic programming.
• 1766. Write a program to implement a basic user registration system.
• 1767. Write a program to check if a string is a valid hex color code.
• 1768. Write a program to find the first character that appears twice in a string.
• 1769. Write a program to implement a simple online calendar application.
• 1770. Write a program to check if a number is a Harshad number using a function.
• 1771. Write a program to find the longest substring with at most k distinct characters.
• 1772. Write a program to check if a string contains balanced parentheses using a stack.
• 1773. Write a program to implement a basic online shopping cart application.
• 1774. Write a program to find the longest sequence of consecutive integers in an array.
• 1775. Write a program to check if a number is a Smith number using its prime factors.
• 1776. Write a program to find the total number of words in a sentence using a function.
• 1777. Write a program to implement a simple text-based game of Chess.
• 1778. Write a program to check if a string is a valid date in the format MM-DD-YYYY.
• 1779. Write a program to find the sum of the first n perfect squares.
• 1780. Write a program to implement a simple online reservation system for restaurants.
• 1781. Write a program to check if two strings can be rearranged to form an anagram.
• 1782. Write a program to find the longest decreasing subsequence in an array.
• 1783. Write a program to implement a basic online survey system.
• 1784. Write a program to check if a number is a perfect number using its divisors.
• 1785. Write a program to find the maximum product of any three numbers in an array.
• 1786. Write a program to implement a simple text-based adventure game with quests.
• 1787. Write a program to check if a string is a valid email address using regex.
• 1788. Write a program to find the first character that occurs more than once in a string.
• 1789. Write a program to implement a basic online restaurant menu.
• 1790. Write a program to check if a number is a happy number using a function.
• 1791. Write a program to find the sum of the first n prime numbers.
• 1792. Write a program to check if a string is a valid URL format.
• 1793. Write a program to implement a basic text file reader and writer.
• 1794. Write a program to find the maximum sum of any two numbers in an array.
• 1795. Write a program to check if a number is a prime number using the Sieve of Eratosthenes.
• 1796. Write a program to find the longest common prefix among an array of strings.
• 1797. Write a program to implement a simple bank account management system.
• 1798. Write a program to check if a number is an automorphic number.
• 1799. Write a program to find the total number of characters in a string using recursion.
• 1800. Write a program to implement a simple character encoding and decoding system.
• 1801. Write a program to check if two strings are equal ignoring case and punctuation.

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