Package g0801_0900.s0814_binary_tree_pruning

Class Solution

java.lang.Object
g0801_0900.s0814_binary_tree_pruning.Solution
public class Solution extends java.lang.Object
814 - Binary Tree Pruning.

Medium

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]

Explanation: 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]

Constraints:

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

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    TreeNode
    pruneTree(TreeNode root)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details