View Compilation Error

1065032_0_0_17611.cpp: In function `int main()':
1065032_0_0_17611.cpp:6: error: `YES' undeclared (first use this function)
1065032_0_0_17611.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
1065032_0_0_17611.cpp:7: error: `NO' undeclared (first use this function)