* [226] Invert Binary Tree * * Invert a binary tree. * * Example: * * Input: * * * 4 * / \ * 2 7 * / \ / \ * 1 3 6 9 * * Output: * * * 4 * / \ * 7 2 * / \ / \ * 9 6 3 1 * * Trivia: * This problem was inspired by this original tweet by <a href
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