View Compilation Error

0_0_22319659_2189.cpp: In function 'int main()':
0_0_22319659_2189.cpp:42:31: error: 'cout' was not declared in this scope
         for(int i=1;i<=n;i++) cout<<tree[i]<<endl;
                               ^
0_0_22319659_2189.cpp:42:46: error: 'endl' was not declared in this scope
         for(int i=1;i<=n;i++) cout<<tree[i]<<endl;
                                              ^