More Problems

• Write a program to check if two strings are isomorphic.
• Write a program to find the sum of all unique elements in an array.
• Write a program to implement a basic text editor with search and replace functionality.
• Write a program to check if a number is a perfect number using its factors.
• Write a program to find the longest increasing subsequence of a list of integers.
• Write a program to implement a basic online file storage application.
• Write a program to check if a binary tree is a valid binary search tree using iterative method.
• Write a program to find the first non-repeating character in a string using a hash map.