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| ╔════════════════╦══════════════════════════════════════════╦══════════════════════════════════════════╗ | |
| ║ Logic ║ Flip Binary Tree ║ Reverse Singly Linked List ║ | |
| ╠════════════════╬══════════════════════════════════════════╬══════════════════════════════════════════╣ | |
| ║ Base Case ║ Root is empty ║ Head is empty ║ | |
| ║ ║ Root has no left child ║ Head has no next node ║ | |
| ║ Recursive Call ║ Call root.left to get the final new root ║ Call head.next to get the final new head ║ | |
| ║ Current Call ║ Let root.left.right point to root ║ Let head.next.next point to head ║ | |
| ║ ║ Let root.left.left point to root.right ║ ║ | |
| ║ ║ Let root.left point to NULL ║ Let head.next point to NULL ║ | |
| ║ ║ Let root.right point to NULL ║ ║ | |
| ║ Return Value ║ The final new root ║ The final new head ║ | |
| ╚════════════════╩══════════════════════════════════════════╩══════════════════════════════════════════╝ |
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