foo.cc: In function 'bool check(double)':
foo.cc:13:24: warning: unused variable 'maxx' [-Wunused-variable]
   13 |     double sum1, sum2, maxx;
      |                        ^~~~
foo.cc: In function 'int main()':
foo.cc:25:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |     scanf("%d%d", &n, &L);
      |     ~~~~~^~~~~~~~~~~~~~~~
foo.cc:27:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   27 |         scanf("%lf", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~~

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