Length of Last Word


Problem Statement :


Given a string s consisting of words and spaces, return the length of the last word in the string.

A word is a maximal 
substring
 consisting of non-space characters only.

 

Example 1:

Input: s = "Hello World"
Output: 5
Explanation: The last word is "World" with length 5.
Example 2:

Input: s = "   fly me   to   the moon  "
Output: 4
Explanation: The last word is "moon" with length 4.
Example 3:

Input: s = "luffy is still joyboy"
Output: 6
Explanation: The last word is "joyboy" with length 6.
 

Constraints:

1 <= s.length <= 104
s consists of only English letters and spaces ' '.
There will be at least one word in s.


Solution :



title-img 


                            Solution in C :

int lengthOfLastWord(char * s){
    int count=0, i;
    int x=strlen(s)-1;
    for(i=strlen(s)-1;i>=0;i--){
        if(s[i]!=' ')
        break;
        x=x-1;
    }
 for(i=x;i>=0;i--){
     if(s[i]==' ')
     break;
     count++;
 }
 return count;
}
                        


                        Solution in C++ :

class Solution {
public:
    int lengthOfLastWord(std::string s) {
        // Trim the input string to remove leading and trailing whitespaces
        size_t first_not_space = s.find_first_not_of(' ');
        size_t last_not_space = s.find_last_not_of(' ');
        s = s.substr(first_not_space, last_not_space - first_not_space + 1);

        // Extract the substring starting from the last occurrence of space + 1 to the end
        size_t last_space = s.find_last_of(' ');
        std::string last_word = s.substr(last_space + 1);

        // Return the length of the last word
        return last_word.length();
    }
};
                    


                        Solution in Java :

class Solution {
    // Function to calculate the length of the last word in a given string
    public int lengthOfLastWord(String s) {
        // Trim the input string to remove leading and trailing whitespaces
        s = s.trim();
        
        // Extract the substring starting from the last occurrence of space + 1 to the end
        String lastWord = s.substring(s.lastIndexOf(' ') + 1);
        
        // Return the length of the last word
        return lastWord.length();
    }
}
                    


                        Solution in Python : 
                            
class Solution:
    def length_of_last_word(self, s: str) -> int:
        # Trim the input string to remove leading and trailing whitespaces
        s = s.strip()
        
        # Extract the substring starting from the last occurrence of space + 1 to the end
        last_word = s[s.rfind(' ') + 1:]
        
        # Return the length of the last word
        return len(last_word)


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