foo.cc: In function 'void init()':
foo.cc:37:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |     scanf("%d%d%d%d",&t,&n,&k,&m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |         scanf("%d%d%d",&x,&y,&w);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:44:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |     scanf("%d",&d);
      |     ~~~~~^~~~~~~~~
foo.cc:47:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   47 |         scanf("%d%d%d",&p,&x,&y);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~

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