/in/foo.cc: In function 'void SPFA1()':
/in/foo.cc:22:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         for(int i=0; i<E1[x].size(); i++) {
      |                      ~^~~~~~~~~~~~~
/in/foo.cc: In function 'void SPFA2()':
/in/foo.cc:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         for(int i=0; i<E2[x].size(); i++) {
      |                      ~^~~~~~~~~~~~~