/in/shortestP2P.cc: In member function 'void ShortestP2P::readGraph()':
/in/shortestP2P.cc:20:24: error: conversion to 'unsigned int' from 'size_t {aka long unsigned int}' may alter its value [-Werror=conversion]
     if (!Final_matrix(i))
                        ^
cc1plus: all warnings being treated as errors