【强化练习】用「遍历」思维解题 II

404. 左叶子之和 https://leetcode.cn/problems/sum-of-left-leaves

404. Sum of Left Leaves https://leetcode.com/problems/sum-of-left-leaves

623. 在二叉树中增加一行 https://leetcode.cn/problems/add-one-row-to-tree

623. Add One Row to Tree https://leetcode.com/problems/add-one-row-to-tree

971. 翻转二叉树以匹配先序遍历 https://leetcode.cn/problems/flip-binary-tree-to-match-preorder-traversal

971. Flip Binary Tree To Match Preorder Traversal https://leetcode.com/problems/flip-binary-tree-to-match-preorder-traversal

987. 二叉树的垂序遍历 https://leetcode.cn/problems/vertical-order-traversal-of-a-binary-tree

987. Vertical Order Traversal of a Binary Tree https://leetcode.com/problems/vertical-order-traversal-of-a-binary-tree

993. 二叉树的堂兄弟节点 https://leetcode.cn/problems/cousins-in-binary-tree

993. Cousins in Binary Tree https://leetcode.com/problems/cousins-in-binary-tree

1315. 祖父节点值为偶数的节点和 https://leetcode.cn/problems/sum-of-nodes-with-even-valued-grandparent

1315. Sum of Nodes with Even-Valued Grandparent https://leetcode.com/problems/sum-of-nodes-with-even-valued-grandparent

1448. 统计二叉树中好节点的数目 https://leetcode.cn/problems/count-good-nodes-in-binary-tree

1448. Count Good Nodes in Binary Tree https://leetcode.com/problems/count-good-nodes-in-binary-tree