How to Solve Minimum Number of Operations to Sort a Binary Tree by Level Problem
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Minimum Number of Operations to Sort a Binary Tree by Level
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 ma...
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Understanding the Minimum Number of Operations to Sort a Binary Tree by Level Problem
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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.
Minimum Number of Operations to Sort a Binary Tree by Level
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Examples
root = [1,4,3,7,6,8,5,null,null,null,null,9,null,10]3- Swap 4 and 3. The 2nd level becomes [3,4]. - Swap 7 and 5. The 3rd level becomes [5,6,8,7]. - Swap 8 and 7. The 3rd level becomes [5,6,7,8]. We used 3 operations so return 3. It can be proven that 3 is the minimum number of operations needed.
root = [1,3,2,7,6,5,4]3- Swap 3 and 2. The 2nd level becomes [2,3]. - Swap 7 and 4. The 3rd level becomes [4,6,5,7]. - Swap 6 and 5. The 3rd level becomes [4,5,6,7]. We used 3 operations so return 3. It can be proven that 3 is the minimum number of operations needed.
root = [1,2,3,4,5,6]0Each level is already sorted in increasing order so return 0.
Constraints
The number of nodes in the tree is in the range [1, 105].1 <= Node.val <= 105All the values of the tree are unique.How Interview Coder Helps with Leetcode Problems
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