/in/foo.cc: In function 'void update(int, int, int, int, int, int)':
/in/foo.cc:33:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   33 | int mid = l + r >> 1;
      |           ~~^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:59:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Line>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 | for (int i = 0; i < events.size(); i++) {
      |                 ~~^~~~~~~~~~~~~~~