This passes all tests I could find so far, but doesn't work on the
website. I wrote an interactive debugger for looking at the input, and
haven't found anything incorrect, so not sure what it wants from me.
Change-Id: I506001735e15b2d02eaaebc6d1da8c26e92acde0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10188
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
