/in/foo.cc: In function 'int main()':
/in/foo.cc:8:17: error: 'b\U0000ff1b' was not declared in this scope
    8 |         cin>>a>>b；
      |                 ^~~
/in/foo.cc:10:16: error: unable to find numeric literal operator 'operator""\U0000ff1b'
   10 |         return 0；
      |                ^~~
/in/foo.cc:10:16: note: use '-fext-numeric-literals' to enable more built-in suffixes
/in/foo.cc:10:19: error: expected ';' before '}' token
   10 |         return 0；
      |                   ^
      |                   ;
   11 | }
      | ~                  
/in/foo.cc:7:15: warning: unused variable 'b' [-Wunused-variable]
    7 |         int a,b;
      |               ^