View Compilation Error

0_0_24996942_17015.cpp: In function 'int main()':
0_0_24996942_17015.cpp:58:1: error: 'cout' was not declared in this scope
 cout<<"NO"<<endl;
 ^
0_0_24996942_17015.cpp:58:13: error: 'endl' was not declared in this scope
 cout<<"NO"<<endl;
             ^