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| 103 |[Binary Tree Zigzag Level Order Traversal](<https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal>)| Medium ||[solution](<markdowns/_103. Binary Tree Zigzag Level Order Traversal.md>)| py |
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| 111 |[Minimum Depth of Binary Tree](<https://leetcode.com/problems/minimum-depth-of-binary-tree>)| Easy ||[solution](<markdowns/_111. Minimum Depth of Binary Tree.md>)| c |
| 113 |[Path Sum II](<https://leetcode.com/problems/path-sum-ii>)| Medium ||[solution](<markdowns/_113. Path Sum II.md>)| py |
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| 114 |[Flatten Binary Tree to Linked List](<https://leetcode.com/problems/flatten-binary-tree-to-linked-list>)| Medium ||[solution](<markdowns/_114. Flatten Binary Tree to Linked List.md>)| py, c |
| 121 |[Best Time to Buy and Sell Stock](<https://leetcode.com/problems/best-time-to-buy-and-sell-stock>)| Easy | B75, N150 |[solution](<markdowns/_121. Best Time to Buy and Sell Stock.md>)| py |
| 426 |[Convert Binary Search Tree to Sorted Doubly Linked List](<https://leetcode.com/problems/convert-binary-search-tree-to-sorted-doubly-linked-list>)| Medium ||[solution](<markdowns/_426. Convert Binary Search Tree to Sorted Doubly Linked List.md>)| py |
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| 430 |[Flatten a Multilevel Doubly Linked List](<https://leetcode.com/problems/flatten-a-multilevel-doubly-linked-list>)| Medium ||[solution](<markdowns/_430. Flatten a Multilevel Doubly Linked List.md>)| java, cpp |
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| 431 |[Encode N-ary Tree to Binary Tree](<https://leetcode.com/problems/encode-n-ary-tree-to-binary-tree>)| Hard ||[solution](<markdowns/_431. Encode N-ary Tree to Binary Tree.md>)| java, py |
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+
| 437 |[Path Sum III](<https://leetcode.com/problems/path-sum-iii>)| Medium ||[solution](<markdowns/_437. Path Sum III.md>)| py |
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| 450 |[Delete Node in a BST](<https://leetcode.com/problems/delete-node-in-a-bst>)| Medium ||[solution](<markdowns/_450. Delete Node in a BST.md>)| py |
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| 451 |[Sort Characters By Frequency](<https://leetcode.com/problems/sort-characters-by-frequency>)| Medium ||[solution](<markdowns/_451. Sort Characters By Frequency.md>)| py |
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| 475 |[Heaters](<https://leetcode.com/problems/heaters>)| Medium ||[solution](<markdowns/_475. Heaters.md>)| py |
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| 502 |[IPO](<https://leetcode.com/problems/ipo>)| Hard | Daily |[solution](<markdowns/_502. IPO.md>)| py |
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| 509 |[Fibonacci Number](<https://leetcode.com/problems/fibonacci-number>)| Easy ||[solution](<markdowns/_509. Fibonacci Number.md>)| c |
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+
| 513 |[Find Bottom Left Tree Value](<https://leetcode.com/problems/find-bottom-left-tree-value>)| Medium ||[solution](<markdowns/_513. Find Bottom Left Tree Value.md>)| java |
| 535 |[Encode and Decode TinyURL](<https://leetcode.com/problems/encode-and-decode-tinyurl>)| Medium ||[solution](<markdowns/_535. Encode and Decode TinyURL.md>)| py |
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| 542 |[01 Matrix](<https://leetcode.com/problems/01-matrix>)| Medium ||[solution](<markdowns/_542. 01 Matrix.md>)| py |
| 654 |[Maximum Binary Tree](<https://leetcode.com/problems/maximum-binary-tree>)| Medium ||[solution](<markdowns/_654. Maximum Binary Tree.md>)| py |
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| 663 |[Equal Tree Partition](<https://leetcode.com/problems/equal-tree-partition>)| Medium | Daily |[solution](<markdowns/_663. Equal Tree Partition.md>)| py |
| 690 |[Employee Importance](<https://leetcode.com/problems/employee-importance>)| Medium ||[solution](<markdowns/_690. Employee Importance.md>)| java |
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| 692 |[Top K Frequent Words](<https://leetcode.com/problems/top-k-frequent-words>)| Medium ||[solution](<markdowns/_692. Top K Frequent Words.md>)| py |
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| 695 |[Max Area of Island](<https://leetcode.com/problems/max-area-of-island>)| Medium | N150 |[solution](<markdowns/_695. Max Area of Island.md>)| c |
| 3074 |[Apple Redistribution into Boxes](<https://leetcode.com/problems/apple-redistribution-into-boxes>)| Easy ||[solution](<markdowns/_3074. Apple Redistribution into Boxes.md>)| py |
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| 3106 |[Lexicographically Smallest String After Operations With Constraint](<https://leetcode.com/problems/lexicographically-smallest-string-after-operations-with-constraint>)| Medium ||[solution](<markdowns/_3106. Lexicographically Smallest String After Operations With Constraint.md>)| py |
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| 3110 |[Score of a String](<https://leetcode.com/problems/score-of-a-string>)| Easy | Daily |[solution](<markdowns/_3110. Score of a String.md>)| java, py |
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