View Compilation Error

0_0_27103175_31963.cpp: In function 'int main()':
0_0_27103175_31963.cpp:20:68: error: invalid operands of types 'const char [4]' and '<unresolved overloaded function type>' to binary 'operator<<'
     while (_--) scanf("%d%d%d",&n,&m,&p),cout<<solve()?"NO":"YES"<<endl;
                                                                    ^