View Compilation Error

0_0_21128119_20609.cpp: In function 'void merge(int, int)':
0_0_21128119_20609.cpp:23:8: error: invalid types 'int[int]' for array subscript
     a[b]=a;
        ^
0_0_21128119_20609.cpp: In function 'int main()':
0_0_21128119_20609.cpp:36:16: error: invalid types 'int[int]' for array subscript
             a[i]=i;
                ^