foo.cc: In function 'int main()':
foo.cc:7:19: error: unable to find numeric literal operator 'operator""i'
    7 |         for(int i=0i<n;i++){
      |                   ^~
foo.cc:7:19: note: use '-fext-numeric-literals' to enable more built-in suffixes
foo.cc:7:27: error: expected ';' before ')' token
    7 |         for(int i=0i<n;i++){
      |                           ^
      |                           ;

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