I'm surprised nobody mentioned LeetCode. You can start solving 100 most popular interview questions (sort them by difficulty first):

https://leetcode.com/problemset/top-100-liked-questions/

If you've never took any algorithm course and have only a week for preparation, it would be very difficult to prepare for coding interview. But I think you can at least finish all easy problems from this list. In this case, you may at least pass screening coding interview.

Right now, I'm very actively interviewing with pretty selective high-frequency trading companies. I can say that LeetCode has pretty relevant set of interview problems.

One more thing. Even if you solved a problem, always look at description of solution, if there is no description of solution, you should look at discussion.

From there, you can find references to common algorithms/themes like binary search etc.