/in/foo.cc:1:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/STACK:1024000000,1024000000") //加栈; 
 
/in/foo.cc:2:0: warning: ignoring #pragma G  [-Wunknown-pragmas]
 #pragma G++ optimize(2)
 
/in/foo.cc: In function 'void spfa(int)':
/in/foo.cc:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<ma[u].size();i++)
                     ~^~~~~~~~~~~~~
/in/foo.cc:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
          for(int j=0;j<ma[v].size();j++)
                      ~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:99:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<ma1[u].size();i++)
                     ~^~~~~~~~~~~~~~