View Compilation Error

0_0_39066219_19989.cpp: In function 'int main()':
0_0_39066219_19989.cpp:7:49: error: 'a' was not declared in this scope
    7 |                 for(int i = 1;i <= n;i++)cin >> a[i];
      |                                                 ^
0_0_39066219_19989.cpp:8:22: error: 'a' was not declared in this scope
    8 |                 sort(a+1,a+n+1);
      |                      ^