foo.cc: In function 'int main()':
foo.cc:37:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 | scanf("%d%d",&m,&n);
      | ~~~~~^~~~~~~~~~~~~~
foo.cc:40:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |   scanf("%d",&w[i][j]);
      |   ~~~~~^~~~~~~~~~~~~~~
foo.cc:59:7: warning: 'xi' may be used uninitialized in this function [-Wmaybe-uninitialized]
   59 |  print(m,xi);
      |  ~~~~~^~~~~~

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