/in/foo.cc: In member function 'void SegmentTree::modify(int&, int, int, int, int)':
/in/foo.cc:37:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid = l + r >> 1;
             ~~^~~
/in/foo.cc: In member function 'void SegmentTree::query(int, int, int, int, int, std::pair<int, int>&)':
/in/foo.cc:47:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid = l + r >> 1;
             ~~^~~