/in/foo.cc: In function 'int main()':
/in/foo.cc:21:15: error: '\U0000ff08vsum' was not declared in this scope; did you mean 'vsum'?
   21 |         asum+=（vsum +d -1）/d*a[nown];
      |               ^~~~~~
      |               vsum
/in/foo.cc:21:26: error: unable to find numeric literal operator 'operator""\U0000ff09'
   21 |         asum+=（vsum +d -1）/d*a[nown];
      |                          ^~~
/in/foo.cc:21:26: note: use '-fext-numeric-literals' to enable more built-in suffixes
/in/foo.cc:22:27: error: unable to find numeric literal operator 'operator""\U0000ff09'
   22 |         vsum=(-（vsum +d -1）/d+vsum/d)*d;
      |                           ^~~
/in/foo.cc:22:27: note: use '-fext-numeric-literals' to enable more built-in suffixes