leetcode/DS_Tree/199+rightSideView.cpp at master · DuanYaQi/leetcode · GitHub

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/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode() : val(0), left(nullptr), right(nullptr) {}
 *     TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
 *     TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}
 * };
 */
class Solution {
public:
    vector<int> rightSideView(TreeNode* root) {
        queue<TreeNode*> que;
        if (root!=NULL) que.push(root);
        vector<int> res;

        while (!que.empty()) {
            int size = que.size();

            for (int i = 0; i < size; i++) {
                TreeNode* node = que.front();
                que.pop();
                if (i == (size-1) ) res.push_back(node->val);
                if (node->left)   que.push(node->left);
                if (node->right)  que.push(node->right);
            }
        }
        return res;
    }
};