Finalized results are out – 139th for me.
The third question would of gotten me 87th and finally 37 points was above the cut off.
In a moment of inspiration, I realised that my solution to the 3rd problem would have solved both the small and the hard, which would have gotten me through.
However, it fails to produce the correct result, even though it runs in time. I guess there is another bug in my ternary search.