Package g0801_0900.s0814_binary_tree_pruning

Class Solution

  • public class Solution
extends 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 Detail

      • Solution

        public Solution()