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Main.java
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Main.java
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package com.company;
class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode() {}
TreeNode(int val) { this.val = val; }
TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
}
public class Main {
public static void main(String[] args) {
// write your code here
}
public TreeNode pruneTree(TreeNode root) {
return !containsOne(root) ? null : root;
}
public boolean containsOne(TreeNode node){
if(node == null) return false;
boolean left = containsOne(node.left);
boolean right = containsOne(node.right);
if(!left) node.left = null;
if(!right) node.right = null;
return node.val == 1 || left || right;
}
}