View Compilation Error

0_0_34361917_16958.cpp: In function 'void solve()':
0_0_34361917_16958.cpp:16:16: error: 'istream_iterator' was not declared in this scope
         copy_n(istream_iterator<int>(cin), n, a.begin());
                ^
0_0_34361917_16958.cpp:16:33: error: expected primary-expression before 'int'
         copy_n(istream_iterator<int>(cin), n, a.begin());
                                 ^
0_0_34361917_16958.cpp:17:33: error: expected primary-expression before 'int'
         copy_n(istream_iterator<int>(cin), m, b.begin());
                                 ^