面试题61 把二叉树打印成多行

题目描述

/*
struct TreeNode {
int val;
struct TreeNode *left;
struct TreeNode *right;
TreeNode(int x) :
val(x), left(NULL), right(NULL) {
}
};
*/
class Solution {
public:
vector<vector<int> > Print(TreeNode* pRoot) {
vector<vector<int> > vec;
if(pRoot == NULL) return vec;

queue<TreeNode*> q;
q.push(pRoot);

while(!q.empty())
{
int lo = 0, hi = q.size();
vector<int> c;
while(lo++ < hi)
{
TreeNode *t = q.front();
q.pop();
c.push_back(t->val);
if(t->left) q.push(t->left);
if(t->right) q.push(t->right);
}
vec.push_back(c);
}
return vec;
}
};