Revision 72e59a3c-0783-4dc8-9a1c-41a8e181d839 - Code Golf Stack Exchange

# [Haskell], 56 bytes

<!-- language-all: lang-hs -->

 f m=maximum[(c,(y,x))|(y,r)<-zip[0..]m,(x,c)<-zip[0..]r]

[Try it online!][TIO-lsae9wt1]

[Haskell]: https://www.haskell.org/
[TIO-lsae9wt1]: https://tio.run/##XU67DoMwDNz5Co@J5CBooVP5hH6B5SFCoEbFCPGQaNV/T5O0Q4UH23e@O/lul0c3DN73II3Y3ckmpFpUT9y1focx66t5uYmKPGdBtWP7R8zs125ZF2iAgKhEODECnREq5gx@FRgy5YG4RGEdW5UssSXzURhDEVJkgEVCdSAiMmEx32vNDJxlYt0YvhE73UBNsxtXyKHXkN70Hw "Haskell – Try It Online"