/in/shortestP2P.cc:3:7: error: redefinition of 'class ShortestP2P'
 class ShortestP2P {
       ^~~~~~~~~~~
In file included from /in/shortestP2P.cc:1:0:
/in/shortestP2P.hpp:11:7: note: previous definition of 'class ShortestP2P'
 class ShortestP2P {
       ^~~~~~~~~~~