View Compilation Error

0_0_39387790_15011.cpp: In function 'int main()':
0_0_39387790_15011.cpp:8:24: error: 'a' was not declared in this scope
    8 |                 cin >> a[i];
      |                        ^
0_0_39387790_15011.cpp:10:15: error: 'a' was not declared in this scope
   10 |         sort( a + 1, a + 1 + n);
      |               ^