foo.cpp: In function 'bool SPFA(int)':
foo.cpp:24:26: error: 'memset' was not declared in this scope
  memset(inq,0,sizeof(inq));
                          ^
foo.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<G[u].size();i++){
                           ^