foo.cc: In function 'void slove(long long int, long long int)':
foo.cc:16:15: error: unable to find numeric literal operator 'operator""\U0000ff09'
   16 |         while(1）
      |               ^~~
foo.cc:16:15: note: use '-fext-numeric-literals' to enable more built-in suffixes
foo.cc:16:18: error: expected ')' before '{' token
   16 |         while(1）
      |              ~   ^
      |                  )
   17 |         {
      |         ~         
foo.cc:23:28: error: expected primary-expression before '^' token
   23 |                 if((a-b>0)^^(a>0))
      |                            ^

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