[LeetCode]Binary Tree Right Side View
2015-04-09 19:52
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Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom.
For example:
Given the following binary tree,
1 <—
/ \
2 3 <—
\ \
5 4 <—
You should return [1, 3, 4].
这道题从一棵二叉树的右侧观察,返回观察到的结点的值的集合。
很容易想到,利用层次遍历,每一层的最后一个结点就是观察到的结点之一。
For example:
Given the following binary tree,
1 <—
/ \
2 3 <—
\ \
5 4 <—
You should return [1, 3, 4].
这道题从一棵二叉树的右侧观察,返回观察到的结点的值的集合。
很容易想到,利用层次遍历,每一层的最后一个结点就是观察到的结点之一。
/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */ class Solution { public: vector<int> rightSideView(TreeNode *root) { vector<int> ans; if (!root) return ans; queue<TreeNode*> q; q.push(root); int count = 1; int num = 0; while (!q.empty()){ root = q.front(); q.pop(); count--; if (root->left){ q.push(root->left); num++; } if (root->right){ q.push(root->right); num++; } if (count == 0){ ans.push_back(root->val); count = num; num = 0; } } return ans; } };
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