/in/foo.cc: In function 'int main()':
/in/foo.cc:6:14: error: 'x\U0000ff1b' was not declared in this scope
    6 |         cin>>x；
      |              ^~~
/in/foo.cc:5:13: warning: unused variable 'x' [-Wunused-variable]
    5 |         int x;
      |             ^