More Problems

• Write a program to check if a binary tree is a valid binary search tree.
• Write a program to find the longest common subsequence in a matrix.
• Write a program to implement a simple search engine for text files.
• Write a program to check if a number is a strong prime using its factors.
• Write a program to find the longest common suffix of two strings.
• Write a program to implement a simple online bookstore with user reviews.
• Write a program to check if a string contains all the letters of the alphabet (pangram).
• Write a program to find the total number of unique elements in an array.