I'm experimenting with a new series on my youtube channel where I try to brainstorm a 1300 rated problem. Let me know if you would like to see more videos of this kind.

Here's the problem description of the first episode : You are given an array, and you have to place $$$k$$$ integers from this array to a box. If at any point the sum of elements in the box becomes even, you discard the entire box. What is the maximum box sum you can gain?

You can attempt the problem on Codeforces. If you are not able to solve it, you can watch the video.