foo.cc: In function ‘int main()’:
foo.cc:57:29: warning: ‘zy’ may be used uninitialized [-Wmaybe-uninitialized]
   57 |                         int ny=zy+dir[k][0],nx=zx+dir[k][1];
      |                             ^~
foo.cc:50:21: note: ‘zy’ was declared here
   50 |                 int zy,zx;
      |                     ^~
foo.cc:57:45: warning: ‘zx’ may be used uninitialized [-Wmaybe-uninitialized]
   57 |                         int ny=zy+dir[k][0],nx=zx+dir[k][1];
      |                                             ^~
foo.cc:50:24: note: ‘zx’ was declared here
   50 |                 int zy,zx;
      |                        ^~

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