foo.cc: In function 'int dijkstra(int)':
foo.cc:21:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int>, std::allocator<std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         for(int i=0;i<g[f.x].size();i++)
      |                     ~^~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:31:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |     scanf("%d:%d",&hour,&mine);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
foo.cc:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |         scanf("%d%d%d",&u,&v,&w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:40:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |     scanf("%d%c",&t,&ch);
      |     ~~~~~^~~~~~~~~~~~~~~

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