View Compilation Error

0_0_36433439_10746.cpp: In function 'int main()':
0_0_36433439_10746.cpp:6:11: error: 'Read' was not declared in this scope
     Read(n);
           ^
0_0_36433439_10746.cpp:23:42: error: 'printf' was not declared in this scope
                 printf("%d\n",nex[nex[0]]);
                                          ^
0_0_36433439_10746.cpp:25:38: error: 'printf' was not declared in this scope
             else printf("%d\n",nex[0]);
                                      ^