Lemonade Change

Statement

There is a lemonade stand where customers can buy one lemonade at a time for $\$5$ and pay with a $\$5$, $\$10$, or $\$20$ bill. It is necessary to return the correct change to each customer so that the net transaction is completed successfully with a total payment of $\$5$. Note that no change is available initially.

Given an integer array, bills, where bills[i] represents the bill paid by the $i^{th}$ customer, return TRUE if it is possible to provide every customer with the correct change, or FALSE otherwise.

Constraints:

• $1 \leq$ bills.length $\leq 500$

• bills[i] is either $5$, $10$, or $20$.

Examples