Topic: hashing-problem / Level: intermediate

• 1951. Write a function to find the frequency of each digit in a number using hashing.
• 1952. Given a string, write a program to find the total number of unique characters in a string using a hash map.
• 1953. Implement a function to check if two arrays contain the same elements using hashing.
• 1954. Create a program to find the longest substring that contains only digits using hashing.
• 1955. Write a function to count the occurrences of each character in a string using a hash map.
• 1956. Given two strings, write a program to check if they can be rearranged to form a palindrome using hashing.
• 1957. Implement a function to find the maximum frequency of any digit in a number using a hash map.
• 1958. Create a program to check if a string is a valid email address using hashing.
• 1959. Write a function to find the longest substring that contains the same character using hashing.
• 1960. Given an array, write a program to count the occurrences of each letter in a string using a hash map.
• 1961. Implement a function to find the longest substring with exactly k distinct characters using hashing.
• 1962. Create a program to find the total number of unique words in a paragraph using hashing.
• 1963. Write a function to determine if two strings can be transformed into another string using hashing.
• 1964. Given a string, write a program to check if it is a valid identifier using hashing.
• 1965. Implement a function to find the maximum product of any two numbers in an array using hashing.
• 1966. Create a program to count the occurrences of each digit in a number using hashing.
• 1967. Write a function to find the total number of unique characters in a string using a hash set.
• 1968. Given two strings, write a program to count the frequency of each character using a hash map.
• 1969. Implement a function to find the first unique integer in an array using a hash map.
• 1970. Create a program to check if a string can be rearranged to form a valid palindrome using hashing.
• 1971. Write a function to find the longest substring that is a palindrome using hashing.
• 1972. Given a list of integers, write a program to count the total number of even numbers using a hash set.
• 1973. Implement a function to check if two arrays have the same frequency of elements using hashing.
• 1974. Create a program to find the longest substring that contains the same character using hashing.
• 1975. Write a function to find the maximum frequency of any character in a string using a hash map.
• 1976. Given a string, write a program to count the occurrences of each letter in the English alphabet in a string using a hash map.
• 1977. Implement a function to find the first character that appears twice in a string using a hash map.
• 1978. Create a program to check if two strings are isomorphic using hashing.
• 1979. Write a function to count the total number of unique words in a paragraph using hashing.
• 1980. Given a string, write a program to check if it can be transformed into a valid number using hashing.
• 1981. Implement a function to find the maximum frequency of any digit in a number using a hash map.
• 1982. Create a program to find the frequency of each letter in a string using a hash map.
• 1983. Write a function to determine if two strings can be transformed into another string using hashing.
• 1984. Given two strings, write a program to find the longest common substring using a hash table.
• 1985. Implement a function to find the longest substring with exactly k distinct characters using hashing.
• 1986. Create a program to count the occurrences of each character in a string using a hash map.
• 1987. Write a function to find the total number of unique characters in a string using a hash set.
• 1988. Given a string, write a program to check if it is a valid identifier using hashing.
• 1989. Implement a function to find the longest palindromic substring in a string using hashing.
• 1990. Create a program to find the total number of vowels and consonants in a string using hashing.
• 1991. Write a function to count the occurrences of each digit in a number using hashing.
• 1992. Given an array, write a program to count the total number of even numbers using a hash set.
• 1993. Implement a function to find the longest substring that contains the same character using hashing.
• 1994. Create a program to check if two strings can be rearranged to form a valid word using hashing.
• 1995. Write a function to find the first unique character in a string using a hash map.
• 1996. Given two strings, write a program to determine if they can be transformed into a valid palindrome using hashing.
• 1997. Implement a function to count the occurrences of each letter in the English alphabet in a string using a hash map.
• 1998. Create a program to find the maximum product of any two distinct elements in an array using hashing.
• 1999. Write a function to find the longest substring that is a palindrome using hashing.
• 2000. Given a string, write a program to count the total number of unique characters in a string using a hash set.

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