View Compilation Error

0_0_20911581_30742.cpp: In function 'int main()':
0_0_20911581_30742.cpp:38:31: error: 'nbsp' was not declared in this scope
             if(iter!=s.end())  
                               ^
0_0_20911581_30742.cpp:38:37: error: 'nbsp' was not declared in this scope
             if(iter!=s.end())  
                                     ^