foo.cc: In function 'int main()':
foo.cc:33:35: error: unable to find numeric literal operator 'operator""\U0000ff1bi'
   33 |                 for(int i = 1;i = 10；i++)
      |                                   ^~~~~
foo.cc:33:35: note: use '-fext-numeric-literals' to enable more built-in suffixes
foo.cc:33:42: error: expected ';' before ')' token
   33 |                 for(int i = 1;i = 10；i++)
      |                                          ^
      |                                          ;
foo.cc:31:21: warning: unused variable 'ans' [-Wunused-variable]
   31 |                 int ans = 0;
      |                     ^~~
foo.cc:32:20: warning: unused variable 'x' [-Wunused-variable]
   32 |                 ll x = n;
      |                    ^

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