But if you want to implement it in the “proper” way, you need to reverse the comparison operation of priority_queue to reverse one. This feature may be useful if you are not planning to change elements in map any more but want to use indices of elements in a way that is impossible in map. Click Save as. In the File Name box, enter a name for the file, if you haven’t already. In the Save as type box, click PDF (*.pdf). Click Standard (publishing online and printing). Click Save.