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Topic: Hashing-question / Level: Intermediate
381. Write a program to determine if a string is a valid expression of numbers and parentheses using hashing.
382. Implement a function to find the total number of unique email addresses in a list using hashing.
383. Create a hash table to store the mapping of country names to their populations.
384. Write a program to find the maximum length of a substring that contains at least one lowercase letter using hashing.
385. Implement a function to check if a string can be rearranged to form a valid anagram, ignoring punctuation, using hashing.
386. Create a hash map to track the number of likes on different posts.
387. Write a program to find the longest substring that contains only whitespace characters using hashing.
388. Implement a function to check if a string is a valid expression of numbers, operators, and parentheses using hashing.
389. Create a hash table to store the mapping of movie titles to their ratings.
390. Write a program to find the total number of unique phrases in a story using hashing.
391. Implement a function to check if two strings can be made equal by swapping characters using hashing.
392. Create a hash map to track the number of users registered on a platform.
393. Write a program to find the longest substring that contains at least two vowels using hashing.
394. Implement a function to check if a string can be rearranged to form a palindrome, considering case sensitivity, using hashing.
395. Create a hash table to store the mapping of recipe names to their preparation times.
396. Write a program to find the maximum length of a substring that contains at least one uppercase letter using hashing.
397. Implement a function to check if a string is a valid hexadecimal expression using hashing.
398. Create a hash map to track the number of shares for different posts on social media.
399. Write a program to find the total number of unique sentences in a text using hashing.
400. Implement a function to find all unique substrings of a given length in a string using hashing.
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Implement a function to check if two strings are anagrams, ignoring case, using hashing.
Implement a function to determine if a string is a valid expression of parentheses using hashing.
Write a program to find the total number of unique phrases in a set of sentences using hashing.
Write a program to find the longest sequence of consecutive numbers in an array using hashing.
Write a program to find the maximum product of two distinct elements in an array using hashing.
Implement a function to determine if a string is a valid number, including decimals and signs, using hashing.
Write a program to find the smallest substring that contains all characters of a given string using hashing.
Implement a function to check if two strings are anagrams of each other, considering case sensitivity, using hashing.
Write a program to find the maximum length of a substring that contains only digits using hashing.
Create a hash table to store the mapping of TV show titles to their genres.
Implement a function to find the longest substring that contains only numbers using hashing.
Implement a function to find the longest palindromic substring using hashing.
Implement a function to check if a string is a palindrome using a hash map.
Write a program to check if a string is a valid number using hashing.
Write a program to find the two numbers that add up to a given target from an array using hashing.