LeetCode 102. Binary Tree Level Order Traversal
広く検索し、アクセスするノードを先進的なルールで維持します.
コード:
コード:
class Solution
{
public:
vector<vector<int> > levelOrder(TreeNode *root)
{
vector<vector<int>> ret;
vector<TreeNode*> same_level_node[2];
same_level_node[0].push_back(root);
while (same_level_node[0].empty() == false)
{
vector<int> num;
same_level_node[1].clear();
for (size_t i = 0; i < same_level_node[0].size(); ++ i)
{
if (same_level_node[0][i] != NULL)
{
num.push_back( same_level_node[0][i]->val );
same_level_node[1].push_back( same_level_node[0][i]->left );
same_level_node[1].push_back( same_level_node[0][i]->right );
}
}
if (num.size() != 0)
{
ret.push_back(num);
}
same_level_node[0] = same_level_node[1];
}
return ret;
}
};