/in/foo.cc: In function 'void BFS(int)':
/in/foo.cc:50:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edgenode>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         for (int i = 0; i < edge[u].size(); i++)
      |                         ~~^~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:76:14: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   76 |     ed =(1<<n+1)-1;
      |             ~^~
/in/foo.cc:91:25: warning: value computed is not used [-Wunused-value]
   91 |                 boat[j] == 1;
/in/foo.cc:106:79: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  106 |             if (boat1[0]==0 && flag[j] && boat1[0] != boat2[0] && tmp2.count()<=m)
      |                                                                   ~~~~~~~~~~~~^~~