foo.cc: In function 'int main()':
foo.cc:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:47:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   47 |   scanf("%d%d%d",&x,&y,&d);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc: In function 'void dijkstra()':
foo.cc:28:12: warning: 'mini' may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |     from[j]=mini;
      |     ~~~~~~~^~~~~
foo.cc: In function 'int main()':
foo.cc:65:9: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   65 |  a[y][x]*=2;
      |  ~~~~~~~^~~
foo.cc:65:9: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]

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