1: Implement a function to find the first unique element in an array using hashing.

2: Create a hash map to track the number of shares for different social media posts.

3: Write a program to find the maximum length of a contiguous subarray with at most two distinct elements using hashing.

4: Implement a function to check if a string is a valid shuffle of two other strings using hashing.

5: Create a hash table to store student IDs and their corresponding GPAs.

6: Write a program to find the smallest substring containing all characters of a given string using hashing.

7: Implement a function to count the number of distinct substrings in a string using hashing.

8: Create a hash map to track the number of clicks on different links in a document.

9: Write a program to find the longest substring that contains the same character repeated at least k times using hashing.

10: Implement a function to find all unique words in a sentence using hashing.