foo.cc: In function 'int main()':
foo.cc:91:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   91 |     scanf("%lld%lld",&n,&q);
      |     ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:93:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   93 |         scanf("%lld",&x);
      |         ~~~~~^~~~~~~~~~~
foo.cc:98:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   98 |         scanf("%lld%lld",&u,&v);
      |         ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:105:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  105 |         scanf("%lld%lld",&s,&t);
      |         ~~~~~^~~~~~~~~~~~~~~~~~

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