More Problems

• Implement a function to check if a string can be transformed into a valid number using hashing.
• Create a program to find the longest substring that contains only digits using hashing.
• Write a function to count the occurrences of each letter in a string using a hash map.
• Given a list of integers, write a program to find the count of unique elements using a hash set.
• Implement a function to find the maximum length of a prefix substring that occurs more than once using hashing.
• Create a program to check if two strings can be rearranged to form a valid word using hashing.
• Write a function to find the first character that occurs twice in a string using a hash map.
• Given a string, write a program to find the total number of vowels in a string using a hash map.