LeetCode 515: Find Largest Value in Each Tree Row Solution
Master LeetCode problem 515 (Find Largest Value in Each Tree Row), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
515. Find Largest Value in Each Tree Row
Problem Explanation
Explanation
To solve this problem, we can perform a level-order traversal of the binary tree and at each level, find the maximum value. We can use a queue data structure to keep track of nodes at each level. We will traverse each level and find the maximum value for that level.
- Initialize a queue with the root node.
- While the queue is not empty, iterate over the nodes at the current level.
- For each node, update the maximum value for that level.
- Add the child nodes to the queue for the next level.
- Repeat the process until all levels are traversed.
The time complexity of this approach is O(N), where N is the number of nodes in the tree. The space complexity is also O(N) in the worst case.
Solution Code
import java.util.*;
class Solution {
public List<Integer> largestValues(TreeNode root) {
List<Integer> result = new ArrayList<>();
if (root == null) return result;
Queue<TreeNode> queue = new LinkedList<>();
queue.offer(root);
while (!queue.isEmpty()) {
int size = queue.size();
int max = Integer.MIN_VALUE;
for (int i = 0; i < size; i++) {
TreeNode node = queue.poll();
max = Math.max(max, node.val);
if (node.left != null) queue.offer(node.left);
if (node.right != null) queue.offer(node.right);
}
result.add(max);
}
return result;
}
}Try It Yourself
Loading code editor...
Related LeetCode Problems
Frequently Asked Questions
How to solve LeetCode 515 (Find Largest Value in Each Tree Row)?
This page provides optimized solutions for LeetCode problem 515 (Find Largest Value in Each Tree Row) in Java, C++, and Python, along with a detailed explanation and an interactive code editor to test your code.
What is the time complexity of LeetCode 515 (Find Largest Value in Each Tree Row)?
The time complexity for LeetCode 515 (Find Largest Value in Each Tree Row) varies by solution. Check the detailed explanation section for specific complexities in Java, C++, and Python implementations.
Can I run code for LeetCode 515 on DevExCode?
Yes, DevExCode provides an interactive code editor where you can write, test, and run your code for LeetCode 515 in Java, C++, or Python.