1. Implement a hash function that takes a string and returns a hash value.
2. Create a hash table with basic operations: insert, delete, and search.
3. Write a program to check for duplicates in an array using hashing.
4. Implement a function to count the frequency of elements in an array using a hash map.
5. Given two strings, write a program to check if they are anagrams using hashing.
6. Create a hash map that maps characters to their counts in a string.
7. Write a function to find the first non-repeating character in a string using hashing.
8. Implement a hash set that supports add, remove, and contains operations.
9. Create a program to find the intersection of two arrays using hashing.
10. Write a function to group anagrams from a list of strings using a hash map.
11. Implement a function to check if two strings are rotations of each other using hashing.
12. Create a hash table that supports collisions using chaining.
13. Write a program to find the longest substring without repeating characters using hashing.
14. Implement a function to find all pairs in an array that sum to a target using hashing.
15. Create a hash map to track the positions of elements in an array.
16. Write a program to find all unique elements in an array using hashing.
17. Implement a function to find the maximum frequency element in an array using hashing.
18. Create a hash table to store a mapping of student IDs to names.
19. Write a function to count the occurrences of a specific character in a string using hashing.
20. Implement a hash function for integers that ensures a uniform distribution.
21. Create a hash map to store word definitions and retrieve them by word.
22. Write a program to find the longest common prefix among an array of strings using hashing.
23. Implement a function to remove duplicates from a sorted array using hashing.
24. Create a hash table that maps words to their lengths from a given list.
25. Write a program to find the two numbers that add up to a given target from an array using hashing.
26. Implement a function to check if a string contains all unique characters using hashing.
27. Create a hash set to keep track of visited nodes in a graph.
28. Write a program to find the maximum product of two distinct elements in an array using hashing.
29. Implement a function to count the number of distinct substrings in a string using hashing.
30. Create a hash map to store the scores of players in a game.
31. Write a program to find the missing number in an array containing numbers from 1 to n using hashing.
32. Implement a function to check if a string is a palindrome using hashing.
33. Create a hash table to store product prices and retrieve them by product ID.
34. Write a program to determine if a string contains a valid permutation of another string using hashing.
35. Implement a function to find the longest consecutive sequence in an unsorted array using hashing.
36. Create a hash map to track the counts of words in a paragraph.
37. Write a program to check if two arrays have the same elements (ignoring order) using hashing.
38. Implement a function to find the element that appears only once in an array of duplicates using hashing.
39. Create a hash table to store employee IDs and their corresponding names.
40. Write a program to find the shortest substring containing all characters of another string using hashing.