$///$ Eparam initialPrice The price of all stocks at the beginning of the day, before any price updates are published.

$///$ aparam orders The sequence of buy and sell orders to be executed.

$///$ aparam feed The exchange feed of price updates to various stocks.

$///$ apre ap initialprice $1.$

$///$ apre ap orders is not empty.

$///$ @pre @p feed is not empty, and is sorted in ascending order by timestamp.

$///$ apre ap The set of all timestamps among orders in ap orders and price updat in ap feed contains no duplicates.

$///$ areturns A collection $[$see below$]$ with the end$-$of$-$day profits and losses of each stock for which at least one order

$///$ was executed. Stocks for which a price update was published but no orders were executed should be excluded from the

$///$ return value.

auto profitsAndLosses$($int initialPrice, const std::vector$<mn\; id="EditorElement\_19340024">0</mn>$rder$>$ &orders, const

std: :vectorcdots