foo.cc: In function 'void init()':
foo.cc:30:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |         scanf("%d%d%s",&x,&y,c);
      |         ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:122:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  122 |     scanf("%lld",&n);
      |     ~~~~~^~~~~~~~~~~
foo.cc:123:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  123 |     scanf("%d",&m);
      |     ~~~~~^~~~~~~~~

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