View Compilation Error

0_0_23160899_30042.cpp: In function 'int main()':
0_0_23160899_30042.cpp:14:9: error: 'cout' was not declared in this scope
         cout<<"YES"<<endl;
         ^
0_0_23160899_30042.cpp:14:22: error: 'endl' was not declared in this scope
         cout<<"YES"<<endl;
                      ^
0_0_23160899_30042.cpp:16:9: error: 'cout' was not declared in this scope
         cout<<"NO"<<endl;
         ^
0_0_23160899_30042.cpp:16:21: error: 'endl' was not declared in this scope
         cout<<"NO"<<endl;
                     ^