How to delete duplicate elements from associative array and Queue in System Verilog

SystemVerilog
, ,
14

I have written a code to remove the dublicate elements in an array

module tb;
integer A[$];
initial
begin
	A={5,5,5,2,2,2,2,2,2,123,321,567,765,5,5,5,5,5};
	for(int i=0;i<=(A.size()-1);i=i+1)
	begin
		for(int j=i+1;j<=(A.size()-1);j=j+1)
		begin
			if(A[i]==A[j])
			begin
				A.delete(j);
			end		
		end
		$display(A[i]);

	end
end
endmodule

The above code is not working.
If I replace the A.delete(j) with A.delete(j–) the code is woking fine. Can anyone please explain me in detail, why the code is not working with A.delete(j) and it is working with A.delete(j–).