foo.cc: In function 'int main()':
foo.cc:16:7: error: invalid types 'int[int]' for array subscript
    a[i]=a[i]-1;
       ^
foo.cc:16:12: error: invalid types 'int[int]' for array subscript
    a[i]=a[i]-1;
            ^

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。