foo.cc: In function 'int main()':
foo.cc:17:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   17 |  if(a[1]>0&&lf==0||a[1]<0&&rt==0)
      |     ~~~~~~^~~~~~~
foo.cc:7:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    7 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
foo.cc:9:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |   scanf("%d", &a[i]);
      |   ~~~~~^~~~~~~~~~~~~

正在同步测试数据，请稍后
Found 10 testcases.
[Hydro](https://hydro.ac)提供评测服务