/in/foo.cc: In function 'int main()':
/in/foo.cc:21:37: error: 'memset' was not declared in this scope
             memset(cnt,0,sizeof(cnt));  
                                     ^
/in/foo.cc:27:29: error: 'memset' was not declared in this scope
     memset(cnt,0,sizeof(cnt));  
                             ^