foo.cc: In function 'int main()':
foo.cc:45:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   45 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:46:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   46 |     for(int i=1;i<=n;i++)scanf("%d%d",&l[i],&g[i]);
      |                          ~~~~~^~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务