Accepted
foo.cc: In function 'int main()':
foo.cc:50:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
50 | scanf("%d%d", &n, &m);
| ~~~~~^~~~~~~~~~~~~~~~
foo.cc:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
54 | scanf("%d%d", &a, &b);
| ~~~~~^~~~~~~~~~~~~~~~
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