Skip to content

Practice Minimum Number of Operations to Sort a Binary Tree by Level

Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.

Medium#2471
LeetCode Problem

Minimum Number of Operations to Sort a Binary Tree by Level

TreeBreadth-First SearchBinary Tree

Problem Statement

You are given the root of a binary tree with unique values. In one operation, you can choose any two nodes at the same level and swap their values. Return the minimum number of operations needed to make the values at each level sorted in a strictly increasing order. The level of a node is the number of edges along the path between it and the root node.

Source: Minimum Number of Operations to Sort a Binary Tree by Level on LeetCode. Use the original task for its coding environment and submissions.

Examples

# Example 1

Input
root = [1,4,3,7,6,8,5,null,null,null,null,9,null,10]
Output
3

# Example 2

Input
root = [1,3,2,7,6,5,4]
Output
3

# Example 3

Input
root = [1,2,3,4,5,6]
Output
0

Constraints

The number of nodes in the tree is in the range [1, 10^5].
1 <= Node.val <= 10^5
All the values of the tree are unique.

Related LeetCode Problems

Practice more problems similar to Minimum Number of Operations to Sort a Binary Tree by Level.

100 Same Tree Easy101 Symmetric Tree Easy102 Binary Tree Level Order Traversal Medium103 Binary Tree Zigzag Level Order Traversal Medium104 Maximum Depth of Binary Tree Easy
← Previous Number of Subarrays With LCM Equal to KNext → Maximum Number of Non-overlapping Palindrome Substrings

Review your practice with PhantomCodeAI

After trying the problem yourself, use the app to discuss your approach, complexity, and edge cases.

Start Free