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Prefix Count Solution – Step-by-Step Explanation

This README provides a detailed explanation of how the Prefix Count problem is solved in different programming languages: C++, Java, JavaScript, Python, and Go. Each explanation follows a structured, step-by-step approach for better understanding.

C++ Code – Step-by-Step Explanation

  1. Define the Function: Start by creating a function prefixCount that takes a vector of strings (words) and a string (pref) as inputs.
  2. Initialize a Counter: Declare an integer variable count and set it to 0. This will track how many words start with the prefix.
  3. Iterate Through Words: Use a for loop to go through each word in the words vector.
  4. Extract the Prefix: For each word, extract the substring of the first pref.size() characters.
  5. Compare Prefix: Check if the extracted substring is equal to the given prefix.
  6. Update Counter: If the prefix matches, increment the counter by 1.
  7. Return the Result: After processing all words, return the value of the counter.

Java Code – Step-by-Step Explanation

  1. Define the Function: Create a method prefixCount that takes an array of strings (words) and a string (pref) as inputs.
  2. Initialize a Counter: Declare an integer variable count and initialize it to 0. This will count matching words.
  3. Loop Through Words: Use a for loop to iterate through each word in the words array.
  4. Check Prefix: For each word, use the startsWith method to check if the word starts with the prefix pref.
  5. Update Counter: If the word starts with the prefix, increment the count variable.
  6. Return the Count: After iterating through all words, return the value of count.

JavaScript Code – Step-by-Step Explanation

  1. Define the Function: Create a function prefixCount that takes an array of strings (words) and a string (pref) as inputs.
  2. Initialize a Counter: Declare a variable count and initialize it to 0. This variable will hold the number of matching words.
  3. Iterate Through Words: Use a for...of loop to go through each word in the words array.
  4. Check Prefix: Use the startsWith method to check if the current word begins with the prefix pref.
  5. Increment Counter: If the word starts with the prefix, increment the count variable by 1.
  6. Return the Result: After processing all the words, return the value of count.

Python Code – Step-by-Step Explanation

  1. Define the Function: Write a function prefixCount that takes a list of strings (words) and a string (pref) as inputs.
  2. Initialize a Counter: Start with a variable count set to 0. This will count the number of words with the desired prefix.
  3. Iterate Through Words: Use a for loop to go through each word in the words list.
  4. Check Prefix: Use the startswith method to check if the current word begins with the prefix pref.
  5. Increment Counter: If the word matches the prefix, increase the count by 1.
  6. Return the Count: After checking all the words, return the value of count.

Go Code – Step-by-Step Explanation

  1. Define the Function: Create a function prefixCount that takes a slice of strings (words) and a string (pref) as parameters.
  2. Initialize a Counter: Declare an integer variable count and set it to 0. This will track the number of matching words.
  3. Loop Through Words: Use a for loop with the range keyword to iterate over each word in the words slice.
  4. Check Prefix: For each word, check if its first len(pref) characters match the prefix using slicing.
  5. Update Counter: If the prefix matches, increment the count variable.
  6. Return the Result: After iterating through all words, return the value of count.