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Dfs

Island Perimeter Problem

Leaf-Similar Trees Problem

Path Sum 3 - Count paths from parent to child

N-ary Tree Postorder Traversal Problem

N-ary Tree Preorder Traversal

Most Frequent Subtree Sum

Lexicographical Numbers Problem

Android Unlock Patterns Problem

House Robber 3 - Houses in Binary Tree

Cousins in Binary Tree Problem

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