foo.cc: In function 'int main()':
foo.cc:8:21: error: 'k\U0000ff1b' was not declared in this scope
    8 |         cin >> x >> k；
      |                     ^~~
foo.cc:7:15: warning: unused variable 'k' [-Wunused-variable]
    7 |         int x,k ;
      |               ^

[Hydro](https://hydro.ac)提供评测服务