Given the root of a binary tree, return the sum of values of its deepest leaves.
Example 1:
Input: root = [1,2,3,4,5,null,6,7,null,null,null,null,8]
Output: 15
Example 2:
Input: root = [6,7,8,2,7,1,3,9,null,1,4,null,null,null,5]
Output: 19
Constraints:
The number of nodes in the tree is in the range [1, 104].
1 <= Node.val <= 100
Code
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int sum; int maxLevel;
public int deepestLeavesSum(TreeNode root) { dfs(root, 1); return sum; }
private void dfs(TreeNode node, int level) { if (node == null) return; if (level > maxLevel) { maxLevel = level; sum = node.val; } else if (level == maxLevel) { sum += node.val; } dfs(node.left, level + 1); dfs(node.right, level + 1); }