I am quite certian I have seen this problem called simply "subset-sums equality" before, so I have just appended "(pigeonhole version)" to the title. I hope that this is increasing the clarity.

## How's this?

I am quite certian I have seen this problem called simply "subset-sums equality" before, so I have just appended "(pigeonhole version)" to the title. I hope that this is increasing the clarity.