You are given an array of transaction strings transactions where each transaction transactions[i] is formatted as a comma separated string "{name},{time},{amount},{city}".

A transaction is considered invalid if:

• The amount strictly exceeds $\$1000$, or

• It takes place within $60$ minutes (inclusive) of another transaction with the same name occurring in a different city.

Return a list of all invalid transactions. You may return the results in any order.

Constraints:

• transactions.length $\leq 1000$

• Each transactions[i] takes the form "{name},{time},{amount},{city}"

• Each name and city consists of lowercase English letters and has a length between $1$ and $10$

• Each time consists of digits and represents an integer between $0$ and $1000$

• Each amount consists of digits and represents an integer between $0$ and $2000$

Now, let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Implement your solution in the following coding playground.