View Compilation Error

0_0_29471268_12308.cpp: In function 'int main()':
0_0_29471268_12308.cpp:4:7: error: 'N' was not declared in this scope
 int a[N];
       ^
0_0_29471268_12308.cpp:5:17: error: 'scanf' was not declared in this scope
 scanf( "%d" , &n);
                 ^
0_0_29471268_12308.cpp:7:16: error: 'a' was not declared in this scope
 scanf( "%d" , &a[ 0 ]);
                ^
0_0_29471268_12308.cpp:13:22: error: '__gcd' was not declared in this scope
 gcd = __gcd(a[i], gcd);
                      ^
0_0_29471268_12308.cpp:14:20: error: 'max' was not declared in this scope
 Max = max(Max, a[i]);
                    ^
0_0_29471268_12308.cpp:17:44: error: 'printf' was not declared in this scope
 printf( "%s\n" , ans % 2 ? "Alice" : "Bob" );
                                            ^