foo.cc: In function 'int main()':
foo.cc:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |     scanf("%d %d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:42:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |         scanf("%d", &num[i]);
      |         ~~~~~^~~~~~~~~~~~~~~
foo.cc:57:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   57 |         scanf("%d", &op);
      |         ~~~~~^~~~~~~~~~~
foo.cc:59:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   59 |             scanf("%d %d %d", &l, &r, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:71:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   71 |             scanf("%d %d", &x, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:76:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   76 |             scanf("%d", &x);
      |             ~~~~~^~~~~~~~~~

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