LeetCode 404 Sum of Left Leaves
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Find the sum of all left leaves in a given binary tree.
Example:
3 / \ 9 20 / \ 15 7There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24.
求二叉树的所有左边叶子的和。
public int sumOfLeftLeaves(TreeNode root) {if (root == null) return 0;int leaf = 0;if (root.left != null && root.left.right == null && root.left.left == null)leaf = root.left.val;return leaf + sumOfLeftLeaves(root.left) + sumOfLeftLeaves(root.right);} 0 0
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