View Compilation Error

0_0_27536172_9305.cpp: In function 'int main()':
0_0_27536172_9305.cpp:9:44: error: invalid operands of types 'const char [3]' and '<unresolved overloaded function type>' to binary 'operator<<'
        string s = a == b ? "YES" : "NO" << endl;
                                            ^