foo.cc: In function 'int main()':
foo.cc:52:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |     scanf("%d%d%d%d", &n, &m, &K, &L);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   54 |         scanf("%d", &t1);
      |         ~~~~~^~~~~~~~~~~
foo.cc:58:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   58 |         scanf("%d", &t1);
      |         ~~~~~^~~~~~~~~~~
foo.cc:62:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   62 |         scanf("%d%d", &t1, &t2);
      |         ~~~~~^~~~~~~~~~~~~~~~~~

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