foo.cc: In function 'int main()':
foo.cc:18:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   18 |             if (p < x || p == x && ansx > r) x = p, ansx = l, ansy = r;
      |                          ~~~~~~~^~~~~~~~~~~
foo.cc:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
foo.cc:11:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |     for (int i = 1; i <= n; ++i) scanf("%d", &a[i]);
      |                                  ~~~~~^~~~~~~~~~~~~

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