You cannot submit for this problem because the homework's deadline is due.

Compile requirements

Please submit a zip or tar file containing shortestP2P.cc and shortestP2P.hpp. You don't need extra files for these test cases.
You must make sure that your code compiles successfully on a Linux operating system with g++ and the options -std=c++1z -Wconversion -Wall -Werror -Wextra -pedantic.