/in/foo.cc: In function 'int main()':
/in/foo.cc:6:1: error: 'cin' was not declared in this scope
 cin>>a>>b>>c>>d>>e>>f>>g>>h>>i>>j;
 ^~~
/in/foo.cc:7:1: error: 'cout' was not declared in this scope
 cout<<j<<" "<<i<<" "<<h<<" "<<g<<" "<<f<<" "<<e<<" "<<d<<" "<<c<<" "<<b<<" "<<a;
 ^~~~