More Problems

• Write a program to check if a string is a valid JSON string.
• Write a program to find the first character that appears twice in a string.
• Write a program to implement a basic shopping application with a cart.
• Write a program to calculate the area of a triangle given its base and height.
• Write a program to check if a given year is a leap year using the modulo operator.
• Write a program to find the number of palindromic substrings in a string.
• Write a program to implement a simple to-do list with deadlines.
• Write a program to calculate the sum of digits of a number using recursion.