foo.cc: In member function 'void interval::load(func)':
foo.cc:121:7: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  121 | if (t = fi(ff.value(l) - f.value(l)))
      |     ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:126:12: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  126 | else if (t = fi(ff.value(r) - f.value(r)))
      |          ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:163:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  163 | scanf("%d %lf", &n, &alpha); n++;
      | ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:164:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  164 | for (int i = 0; i < n; i++) scanf("%lf", &h[i]);
      |                             ~~~~~^~~~~~~~~~~~~~
foo.cc:165:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  165 | for (int i = 0; i < n - 1; i++) scanf("%lf", &r[i]);
      |                                 ~~~~~^~~~~~~~~~~~~~

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