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All topics›JavaScript›Trees

Invert Binary Tree

beginnerlayer I1 · Trees5 tests

Flip a binary tree horizontally: every node's left and right children swap places, all the way down. Return the root.

  • Rearrange the existing nodes in place — the returned root must be the node you were given
  • An empty tree inverts to null
  • toArray(root) serialises a tree back to level-order form so you can eyeball the result

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