More Problems

• Write a program to implement a simple online course registration system.
• Write a program to check if a number is a sociable number.
• Write a program to find the total number of unique characters in a string.
• Write a program to implement the insertion sort algorithm.
• Write a program to check if two numbers are coprime using the Euclidean algorithm.
• Write a program to find the longest increasing subsequence in a matrix.
• Write a program to implement a simple online polling system.
• Write a program to check if a binary tree is a valid binary search tree.