foo.cc: In function 'int main()':
foo.cc:56:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |                 scanf("%1d",&b[i][j]);
      |                 ~~~~~^~~~~~~~~~~~~~~~
foo.cc:60:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   60 |         scanf("%d%d%d%d",&x,&y,&xx,&yy);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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Found 10 testcases.
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