foo.cc: In function 'int main()':
foo.cc:9:20: error: 'n' was not declared in this scope
    9 |         {    while(n<=r&&n>=l)
      |                    ^
foo.cc:11:30: error: unable to find numeric literal operator 'operator""o'
   11 |                          a=n/1o;
      |                              ^~
foo.cc:11:30: note: use '-fext-numeric-literals' to enable more built-in suffixes
foo.cc:19:2: error: expected '}' at end of input
   19 | }
      |  ^
foo.cc:9:9: note: to match this '{'
    9 |         {    while(n<=r&&n>=l)
      |         ^
foo.cc:19:2: error: expected '}' at end of input
   19 | }
      |  ^
foo.cc:4:1: note: to match this '{'
    4 | {
      | ^

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