More Problems

• Write a program to implement a simple online quiz application with multiple-choice questions.
• Write a program to check if a number is a perfect square using binary search.
• Write a program to find the first unique character in a string using a frequency count.
• Write a program to implement the depth-first search (DFS) algorithm for a binary tree.
• Write a program to check if a string can be converted to a palindrome with one deletion.
• Write a program to find the total number of distinct characters in a string using a hash map.
• Write a program to implement a simple online library system with search functionality.
• Write a program to check if a number can be expressed as the sum of four squares.