foo.cc: In function 'int main()':
foo.cc:7:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf( "%d",&n );
 ~~~~~^~~~~~~~~~~
foo.cc:12:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%u",&t);
 ~~~~~^~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务