Length-of-Last-Word.java

class Solution {
    public int lengthOfLastWord(String s) {
        // Brute Force :
        /*String s1 = s.trim();
        int lastLen = 0,N = s1.length(), ptr = 0;

        while(ptr < N){
            if(s1.charAt(ptr) == ' '){
                lastLen = 0;
            }
        
            else{
                lastLen++;
            }
        
            ptr++;
        }
        
        return lastLen;*/
        
        // Optimised Approach
        int len = 0;
        int i = s.length() - 1;

        while(i >= 0){
            if(s.charAt(i) == ' '){
                if(len == 0){
                    i--;
                }

                else{
                    break;
                }
            }

            else{
                len++;
                i--;
            }
        }
        return len;
    }
}