class Solution {
/**
* @param root: The root of binary tree.
* @return: Level order a list of lists of integer
*/
public:
void lev(TreeNode* node, int levelnum, vector
LintCode-剑指Offer-(70)二叉树的层次遍历Ⅱ

class Solution {
/**
* @param root: The root of binary tree.
* @return: Level order a list of lists of integer
*/
public:
void lev(TreeNode* node, int levelnum, vector