View Compilation Error

0_0_30788443_8490.cpp: In function 'int main()':
0_0_30788443_8490.cpp:85:9: error: 'cout' was not declared in this scope
         cout<<ans<<endl;
         ^
0_0_30788443_8490.cpp:85:20: error: 'endl' was not declared in this scope
         cout<<ans<<endl;
                    ^