814. Binary Tree Pruning LeetCode Solution | Easy Approach

Minimum Cost to Merge Stones

Binary Tree Pruning Given the root of a binary tree, return the same tree where every subtree (of the given tree) not containing a 1 has been removed.

A subtree of a node node is node plus every node that is a descendant of node.

Example 1:

Input: root = [1,null,0,0,1]
Output: [1,null,0,null,1]
Only the red nodes satisfy the property "every subtree not containing a 1".
The diagram on the right represents the answer.

Example 2:

Input: root = [1,0,1,0,0,0,1]
Output: [1,null,1,null,1]

Example 3:

Input: root = [1,1,0,1,1,0,1,0]
Output: [1,1,0,1,1,null,1]


  • The number of nodes in the tree is in the range [1, 200].
  • Node.val is either 0 or 1.

Binary Tree Pruning Solutions

Time: O(n)
Space: O(n)


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