View Compilation Error

0_0_39833159_29240.cpp: In function 'll f(ll)':
0_0_39833159_29240.cpp:22:14: error: unable to find numeric literal operator 'operator""r'
   22 |         it = 1r;
      |              ^~
0_0_39833159_29240.cpp:22:14: note: use '-fext-numeric-literals' to enable more built-in suffixes