More Problems

• Write a program to check if a number can be expressed as a sum of three prime numbers.
• Write a program to find the longest substring of unique characters in a string.
• Write a program to implement a simple online movie rating system.
• Write a program to check if a string is a valid date in the format DD-MM-YYYY.
• Write a program to find the maximum sum rectangle in a binary matrix.
• Write a program to implement the BFS (Breadth-First Search) algorithm for graph traversal.
• Write a program to check if a string can be rearranged to form a palindrome.
• Write a program to find the first unique character in a string using a hash map.