foo.cc: In function 'int main()':
foo.cc:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
8 | scanf("%d%d%d", &n, &m, &q);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
9 | scanf("%s%s", s, t);
| ~~~~~^~~~~~~~~~~~~~
foo.cc:26:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
26 | scanf("%d%d", &l, &r);
| ~~~~~^~~~~~~~~~~~~~~~
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