View Compilation Error

0_0_35585432_15535.cpp: In function 'int main()':
0_0_35585432_15535.cpp:37:11: error: 'a' was not declared in this scope
    cin >> a[i];
           ^
0_0_35585432_15535.cpp:41:8: error: 'a' was not declared in this scope
   sort(a,a+n,cmp);
        ^
0_0_35585432_15535.cpp: At global scope:
0_0_35585432_15535.cpp:52:2: error: expected unqualified-id before 'return'
  return 0;
  ^
0_0_35585432_15535.cpp:53:1: error: expected declaration before '}' token
 }
 ^