delete-nodes-tree

// Not my Solution

var delNodes = function(root, to_delete) {
  let res = [];
  let set = new Set();
  for(let i of to_delete) set.add(i);
  let dfs = (node) => {
    if(!node) return node;
    node.left = dfs(node.left);
    node.right = dfs(node.right);
    if(set.has(node.val)) {
      if(node.left) res.push(node.left);
      if(node.right) res.push(node.right);
      return null;
    }
    return node;
  }
  dfs(root);
  if(!set.has(root.val)) res.push(root);
  return res;
};