More Problems

• Write a program to check if a string is a valid date in the format YYYY/MM/DD.
• Write a program to find the first missing positive integer in an unsorted array.
• Write a program to implement a basic quiz application that calculates user scores.
• Write a program to check if a number is an automorphic number using a function.
• Write a program to find the longest substring without repeating characters.
• Write a program to implement a simple game of Minesweeper.
• Write a program to check if a string is a valid time in the 24-hour format.
• Write a program to find the sum of all unique elements in an array.