Binary tree next link https://leetcode.com/problems/populating-next-right-pointers-in-each-node/
Binary tree next link
https://leetcode.com/problems/populating-next-right-pointers-in-each-node/

- Use queue to iterate each level of tree nodes
- Use the same queue, but need a marker to know the end of a level
- Do it one level at a time
Test: leetcode passed

devastating/misc,devastating/misc,devastating/misc