View Compilation Error

0_0_35609193_11494.cpp: In function 'int main()':
0_0_35609193_11494.cpp:17:9: error: invalid types 'int[int]' for array subscript
    a[r+1]-=1;
         ^
0_0_35609193_11494.cpp:18:7: error: invalid types 'int[int]' for array subscript
    a[l]+=1;
       ^
0_0_35609193_11494.cpp:21:25: error: invalid types 'int[int]' for array subscript
    sum[i] = sum[i-1]+a[i];
                         ^