foo.cc: In function 'int main()':
foo.cc:6:8: error: 'a' was not declared in this scope
   cin>>a;
        ^
foo.cc:6:8: note: suggested alternative: 'as'
   cin>>a;
        ^
        as
foo.cc:7:2: error: 's' was not declared in this scope
  s=a*a;
  ^
foo.cc:7:2: note: suggested alternative: 'as'
  s=a*a;
  ^
  as
foo.cc:5:9: warning: unused variable 'as' [-Wunused-variable]
     int as;
         ^~

[Hydro](https://hydro.ac)提供评测服务