foo.cc: In function 'int main()':
foo.cc:13:16: warning: left operand of comma operator has no effect [-Wunused-value]
   for(int j=l;i<r,j++)
               ~^~
foo.cc:13:22: error: expected ';' before ')' token
   for(int j=l;i<r,j++)
                      ^
foo.cc:14:8: warning: statement has no effect [-Wunused-value]
    a[j]==1;
    ~~~~^~~
foo.cc:16:2: error: 'sort' was not declared in this scope
  sort(a,a+1000);
  ^~~~
foo.cc:16:2: note: suggested alternative: 'qsort'
  sort(a,a+1000);
  ^~~~
  qsort

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