View Compilation Error

0_0_19990061_30791.cpp: In function 'int main()':
0_0_19990061_30791.cpp:20:36: error: 'ostream_iterator' was not declared in this scope
         copy(ia.begin(),ia.end()-1,ostream_iterator<int>(cout," "));
                                    ^
0_0_19990061_30791.cpp:20:53: error: expected primary-expression before 'int'
         copy(ia.begin(),ia.end()-1,ostream_iterator<int>(cout," "));
                                                     ^