Length of Last Word

Length of Last Word - InterviewBitInterviewBit

int Solution::lengthOfLastWord(const string A) {
    int len = 0;
    int i = A.size() - 1;
    while(i >= 0 && A[i] == ' ')
        i--;
    while(i >= 0 && A[i] != ' ')
        i--, len++;
        
    return len;
}

Time Complexity: $O(n)$​

Space Complexity: $O(1)$​

Edge Case: What if there are spaces the end of the string "Hello Wolrd "