private static LeetCode114TreeNode Helper(LeetCode114TreeNode root) { if (root == null) { return(null); } if (root.IsLeaf()) { return(root); } var left = Helper(root.left); var right = Helper(root.right); if (left != null) { left.right = root.right; root.right = root.left; root.left = null; } return(right == null ? left : right); }
public static void FlattenBinaryTree(LeetCode114TreeNode root) { Helper(root); }
public LeetCode114TreeNode(int val = 0, LeetCode114TreeNode left = null, LeetCode114TreeNode right = null) { this.val = val; this.left = left; this.right = right; }