Topic: hashing-problem / Level: intermediate

• 1851. Create a program to find the longest substring with at most k distinct characters using hashing.
• 1852. Write a function to count the total number of vowels and consonants in a string using hashing.
• 1853. Given a list of integers, write a program to find the total number of unique characters in a string using hashing.
• 1854. Implement a function to check if two strings can be rearranged to form a valid word using hashing.
• 1855. Create a program to find the first unique character in a string using a hash map.
• 1856. Write a function to check if two strings can be transformed into a palindrome using hashing.
• 1857. Given an array, write a program to find the total number of even numbers using a hash set.
• 1858. Implement a function to find the maximum frequency of any character in a string using a hash map.
• 1859. Create a program to find the total number of unique characters in a string using a hash set.
• 1860. Write a function to determine if two strings are anagrams using hashing.
• 1861. Given a string, write a program to count the occurrences of a specific letter using a hash map.
• 1862. Implement a function to find the longest substring that is a palindrome using hashing.
• 1863. Create a program to check if two strings can be made identical by swapping characters using hashing.
• 1864. Write a function to find the total number of consonants in a string using a hash map.
• 1865. Given a string, write a program to find the first unique character in a string using a hash map.
• 1866. Implement a function to count the occurrences of each character in a string using a hash map.
• 1867. Create a program to find the longest substring with exactly one repeating character using hashing.
• 1868. Write a function to check if a string can be transformed into a valid number using hashing.
• 1869. Given a list of integers, write a program to find the total number of odd numbers using a hash set.
• 1870. Implement a function to find the maximum frequency of any digit in a number using a hash map.
• 1871. Create a program to check if a string contains balanced parentheses using a hash map.
• 1872. Write a function to find the longest substring that contains only digits using hashing.
• 1873. Given an array, write a program to count the number of unique characters using hashing.
• 1874. Implement a function to find the frequency of each digit in a number using hashing.
• 1875. Create a program to check if two strings can be rearranged to form a palindrome using hashing.
• 1876. Write a function to determine if two strings can be transformed into another string using hashing.
• 1877. Given a string, write a program to find the longest substring that contains the same character using hashing.
• 1878. Implement a function to find the maximum frequency of any character in a list of strings using hashing.
• 1879. Create a program to count the occurrences of each letter in the English alphabet in a string using a hash map.
• 1880. Write a function to find the total number of unique words in a paragraph using hashing.
• 1881. Given a string, write a program to check if it is a valid identifier using hashing.
• 1882. Implement a function to find the first character that appears three times in a string using a hash map.
• 1883. Create a program to count the total number of vowels and consonants in a string using hashing.
• 1884. Write a function to find the longest substring that is a palindrome using hashing.
• 1885. Given an array, write a program to find the total number of even numbers using a hash set.
• 1886. Implement a function to find the longest substring with exactly one repeating character using hashing.
• 1887. Create a program that checks if two strings can be rearranged to form a valid palindrome using hashing.
• 1888. Write a function to count the total number of unique characters in a string using hashing.
• 1889. Given two strings, implement a function to check if they are anagrams using hashing.
• 1890. Create a program to find the frequency of each letter in the English alphabet in a string using a hash map.
• 1891. Write a function to check if a string can be transformed into a valid number using hashing.
• 1892. Given a string, write a program to find the longest substring with at most k distinct characters using hashing.
• 1893. Implement a function to find the maximum frequency of any character in a string using a hash map.
• 1894. Create a program to count the occurrences of each digit in a number using hashing.
• 1895. Write a function to determine if two strings can be rearranged to form a valid word using hashing.
• 1896. Given an array, write a program to find the total number of odd numbers using a hash set.
• 1897. Implement a function to check if two strings can be rearranged to form a palindrome using hashing.
• 1898. Create a program to find the first character that appears twice in a string using a hash map.
• 1899. Write a function to count the total number of unique characters in a string using hashing.
• 1900. Given a string, write a program to check if it is a valid email address using hashing.

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