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Number of Words in a String

Certification: Basic Level Accuracy: 50% Submissions: 12 Points: 5

Write a C++ program that counts the number of words in a given string. A word is defined as a sequence of non-space characters.

Example 1
    
  
  • Input: string = "Hello World"
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  • Output: 2
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  • Explanation: 
      
    
    • Step 1: Split the input string by spaces.
      • 
    
    • Step 2: Count the number of non-empty elements.
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    • Step 3: Return the count.
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    •
Example 2
    
  
  • Input: string = "   This is a test   "
    • 
  
  • Output: 4
    • 
  
  • Explanation: 
      
    
    • Step 1: Split the input string by spaces.
      • 
    
    • Step 2: Count the number of non-empty elements after removing leading and trailing spaces.
      • 
    
    • Step 3: Return the count.
      • 
  
    •
Constraints
    
  
  • 1 ≤ len(string) ≤ 10^6
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  • String contains printable ASCII characters
    • 
  
  • Time Complexity: O(n), where n is the length of the string
    • 
  
  • Space Complexity: O(1)
    •
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Hint
Solution

Solution Hints

    
  
  • Iterate through the string and count the number of transitions from space to non-space characters.
    • 
  
  • Handle leading and trailing spaces separately.
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  • Consider edge cases where the string is empty or contains only spaces.
    •

Steps to solve by this approach:

 Step 1: Define a function countWords that takes a constant string reference.

 Step 2: Initialize a counter variable to 0 and a boolean flag (inWord) to track if we're inside a word.

 Step 3: Iterate through each character in the string.

 Step 4: If the character is not a space and we're not currently in a word, increment the counter and set inWord to true.

 Step 5: If the character is a space, set inWord to false.

 Step 6: Return the final count after processing all characters.

Submitted Code :