foo.cc: In function 'int main()':
foo.cc:11:19: warning: 'd' is used uninitialized [-Wuninitialized]
   11 |         for(int d;d<a;d++){
      |                   ^
foo.cc:11:17: note: 'd' was declared here
   11 |         for(int d;d<a;d++){
      |                 ^
foo.cc:55:15: warning: 'h' may be used uninitialized [-Wmaybe-uninitialized]
   55 |     for(int h;h<a;h++){
      |               ^
foo.cc:55:13: note: 'h' was declared here
   55 |     for(int h;h<a;h++){
      |             ^

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