foo.cc: In function 'double Dijkstra(int, int)':
foo.cc:58:10: warning: unused variable 'ds' [-Wunused-variable]
   58 |   double ds = W.dis;
      |          ^~
foo.cc: In function 'int main()':
foo.cc:80:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   80 |  scanf("%d%d",&N,&M);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:84:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   84 |   scanf("%d%d%d",&x,&y,&z);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:91:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   91 |  scanf("%d%d",&A,&B);
      |  ~~~~~^~~~~~~~~~~~~~

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