View Compilation Error

0_0_15111291_12503.cpp:6:1: error: expected ',' or ';' before 'int'
 int num[MX];
 ^
0_0_15111291_12503.cpp: In function 'int main()':
0_0_15111291_12503.cpp:10:48: error: 'num' was not declared in this scope
         for(int i = 0; i < n; i++) scanf("%d",&num[i]);
                                                ^
0_0_15111291_12503.cpp:11:14: error: 'num' was not declared in this scope
         sort(num,num+n);
              ^
0_0_15111291_12503.cpp:11:23: error: 'sort' was not declared in this scope
         sort(num,num+n);
                       ^
0_0_15111291_12503.cpp:11:23: note: suggested alternative:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:62:0,
                 from 0_0_15111291_12503.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_algo.h:4705:5: note:   'std::sort'
     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
     ^