View Compilation Error

0_0_24649683_21613.cpp: In function 'int main()':
0_0_24649683_21613.cpp:18:16: error: invalid types 'int[int]' for array subscript
             a[i]=a-b;
                ^
0_0_24649683_21613.cpp:19:18: error: invalid types 'int[int]' for array subscript
             a[i+n]=a-b;
                  ^