foo.cc: In function 'int main()':
foo.cc:18:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
foo.cc:21:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   21 |         scanf("%lld", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~~~
foo.cc:17:12: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
   17 |     int s, t;
      |            ^
foo.cc:17:9: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   17 |     int s, t;
      |         ^

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