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First non repeating character

Question

First non repeating character

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Solution

To find the first non-repeating character, you can follow these steps:

  1. Initialize an empty dictionary to store the frequency of each character in the given string.
  2. Iterate through each character in the string.
  3. For each character, check if it exists in the dictionary. If it does, increment its frequency by 1. If it doesn't, add it to the dictionary with a frequency of 1.
  4. After iterating through all the characters, iterate through the string again.
  5. For each character, check its frequency in the dictionary. If the frequency is 1, return that character as the first non-repeating character.
  6. If no non-repeating character is found, return a message indicating that there are no non-repeating characters in the string.

Here is an example implementation in Python:

def find_first_non_repeating_character(string):
    char_frequency = {}
    
    # Count the frequency of each character
    for char in string:
        if char in char_frequency:
            char_frequency[char] += 1
        else:
            char_frequency[char] = 1
    
    # Find the first non-repeating character
    for char in string:
        if char_frequency[char] == 1:
            return char
    
    return "No non-repeating character found"

# Example usage
string = "abacabad"
result = find_first_non_repeating_character(string)
print(result)  # Output: 'c'

This implementation has a time complexity of O(n), where n is the length of the string.

This problem has been solved

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