More Problems

• Given a string, write a function to find the longest substring that contains at most two distinct characters using hashing.
• Write a program to find the total number of characters in a string excluding spaces using a hash set.
• Create a function that checks if a string can be rearranged to form a palindrome using hashing.
• Implement a function to count the number of valid email addresses in a list using hashing.
• Write a program to find the first duplicate character in a string using hashing.
• Create a function that checks if a given string is a valid number using a hash map.
• Given an array, write a program to return the indices of all occurrences of a target integer using hashing.
• Write a function to find the maximum sum of any contiguous subarray using hashing.