Implement the function to compute stock pressure.

To compute positive stock pressure for each stock price, you should find the last day with the

lower $($or equal$)$ price. In other words, the positive stock pressure is the number of days since the

last day with a lower or equal price. Below is an example for $1$ week of data.

$|$ Price $|$ Stock Pressure

$------------------------------$

$|$ Day $1|100|1$

$------------------------------$

$|$ Day $2|90|2$

$------------------------------$

$|$ Day $3|95|1$

$------------------------------$

$|$ Day $4|100|1$

$-------------------------------$

$|$ Day $5|105|1$

$-------------------------------$

$|$ Day $6|110|1$

$-------------------------------$

$|$ Day $7|80|7$

$-------------------------------$