Main.cc:3:1: error: 'a' does not name a type a[1001]; ^ Main.cc: In function 'int main()': Main.cc:9:11: error: invalid types 'int[int]' for array subscript cin>>a[i]; ^ Main.cc:14:14: error: invalid types 'int[int]' for array subscript t = abs(a[i]-a[i]); ^ Main.cc:14:19: error: invalid types 'int[int]' for array subscript t = abs(a[i]-a[i]); ^