104. Maximum Depth of Binary Tree

Day 4/100 ✅

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226. Invert Binary Tree

Day 5/100 ✅

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144. Binary Tree Preorder Traversal

Day 6/100 ✅

missed yesterday, but don't wanna stop the challenge because of just this.

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58. Length of Last Word

Day 7/100 ✅

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230. Kth Smallest Element in a BST

Day 8/100 ✅

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66. Plus One

Day 9/100 ✅

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