foo.cc: In function 'int main()':
foo.cc:31:13: warning: 'ey' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |   if(p.x==ex&&p.y==ey){
      |      ~~~~~~~^~~~~~~~~
foo.cc:31:3: warning: 'ex' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |   if(p.x==ex&&p.y==ey){
      |   ^~
foo.cc:28:11: warning: 'sy' may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |  d[sx][sy]=0;
      |  ~~~~~~~~~^~
foo.cc:28:11: warning: 'sx' may be used uninitialized in this function [-Wmaybe-uninitialized]

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