https://leetcode.com/problems/sum-of-left-leaves/
Find the sum of all left leaves in a given binary tree.
Example:
3
/ 9 20
/ 15 7
There are two left leaves in the binary tree, with values 9 and 15 respectively. Return 24.
代码：
/**
* Definition for a binary tree node.
* struct TreeNode {
* int val;
* TreeNode *left;
* TreeNode *right;
* TreeNode(int x) : val(x), left(NULL), right(NULL) {}
* };
*/
class Solution {
public:
int sumOfLeftLeaves(TreeNode* root) {
if(!root) return 0;
int sum = 0;
if(root -> left && !root -> left -> left && !root -> left -> right)
sum = root -> left -> val;
sum += sumOfLeftLeaves(root -> left) + sumOfLeftLeaves(root -> right);
return sum;
}
};
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#Leetcode# 404. Sum of Left Leaves
原文：https://www.cnblogs.com/zlrrrr/p/10115972.html