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class Solution {
public:
    int lengthOfLastWord(string s) {
        int counter=0;
        bool found=false;
        for(int i=s.length()-1; i>=0; i--){
            if(s[i]!=' '){
                counter++;
                found=true;
            }
            else if(s[i]==' ' and found){
                break;
            }
        }
        return counter;
    }
 
};

prog.cpp:3:26: error: ‘string’ has not been declared
     int lengthOfLastWord(string s) {
                          ^~~~~~
prog.cpp: In member function ‘int Solution::lengthOfLastWord(int)’:
prog.cpp:6:21: error: request for member ‘length’ in ‘s’, which is of non-class type ‘int’
         for(int i=s.length()-1; i>=0; i--){
                     ^~~~~~
prog.cpp:7:19: error: invalid types ‘int[int]’ for array subscript
             if(s[i]!=' '){
                   ^
prog.cpp:11:24: error: invalid types ‘int[int]’ for array subscript
             else if(s[i]==' ' and found){
                        ^

Standard output is empty