The submission is here: 265738238
I do not think that I use significant stack memory here, it is mostly heap memory. Also I have cloned to the mashup to test with 2GB memory limits and got exactly the same result.
The code is pretty clear in my opinion but I will be happy to clarify if asked.
Thanks for your interest.








You seem to have WA on a testcase, because putting the following
ifstatement in the middle makes the code not RE but WA.So, the RE is probably due to a wrong value of
last.Thank you so much, I will focus on fixing it.
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