answer.code:34:10: error: ‘https’ does not name a type
   34 |         }https://qoj.ac/contest/35
      |          ^~~~~
answer.code: In member function ‘void Segment::update(int&, int, int, int, int, int)’:
answer.code:47:17: error: ‘up’ was not declared in this scope; did you mean ‘u’?
   47 |                 up(u);
      |                 ^~
      |                 u
answer.code: In member function ‘void Segment::build(int&, int, int)’:
answer.code:64:17: error: ‘up’ was not declared in this scope; did you mean ‘u’?
   64 |                 up(u);
      |                 ^~
      |                 u
answer.code: In function ‘int main()’:
answer.code:68:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   68 |         freopen("in.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~