【leetcode】116.（Medium）Populating Next Right Pointers in Each Node
解題思路：
遞迴
提交程式碼：
class Solution { public void connect(TreeLinkNode root) { if(root==null||root.left==null) return; root.left.next=root.right; if(root.next!=null) { root.right.next=root.next.left; } connect(root.left); connect(root.right); } }
執行結果：
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