foo.cc: In function 'int main()':
foo.cc:58:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   58 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:63:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   63 |         scanf("%d", &num[i]);
      |         ~~~~~^~~~~~~~~~~~~~~
foo.cc:81:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   81 |         scanf("%d", &op);
      |         ~~~~~^~~~~~~~~~~
foo.cc:83:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   83 |             scanf("%d %d %d", &l, &r, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:98:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   98 |             scanf("%d %d", &x, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:107:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  107 |             scanf("%d", &x);
      |             ~~~~~^~~~~~~~~~

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