More Problems

• Write a program to check if a number is a perfect number by calculating the sum of its divisors.
• Write a program to find the first duplicate element in an array using a function.
• Write a program to implement a simple online ticket booking application.
• Write a program to check if a string is a valid binary number.
• Write a program to find the longest increasing subsequence in an array using dynamic programming.
• Write a program to check if a string is a valid URL using regular expressions.
• Write a program to implement a basic online voting system with a user interface.
• Write a program to check if a number is a triangular number using a function.