foo.cc: In function 'void spfa(int)':
foo.cc:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         for(int i=0;i<a[x].to.size();i++){
      |                     ~^~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:36:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   36 |     scanf("%d%d%d%d%d",&n,&k,&m,&s,&t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:37:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |     For(i,1,n) scanf("%d",&c[i]);
      |                ~~~~~^~~~~~~~~~~~
foo.cc:38:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |     For(i,1,k) For(j,1,k) scanf("%d",&map[i][j]);
      |                           ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:41:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |         scanf("%d%d%d",&x,&y,&z);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~

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