/in/foo.cc:7:18: error: stray '\357' in program
    7 |  while(cin>>n>>m)；{
      |                  ^
/in/foo.cc:7:19: error: stray '\274' in program
    7 |  while(cin>>n>>m)；{
      |                   ^
/in/foo.cc:7:20: error: stray '\233' in program
    7 |  while(cin>>n>>m)；{
      |                    ^