Same Tree
Same Tree: Given the roots of two binary trees p and q, write a function to check if they are the same or not.
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Invert A Binary Tree
Invert A Binary Tree: Given the root of a binary tree, invert the tree, and return its root.
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Find Smallest Letter Greater Than Target
Find Smallest Letter Greater Than Target: You are given an array of characters letters that is sorted in non-decreasing order, and a character target.
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Binary Search
Binary Search: Given an array of integers nums which is sorted in ascending order, and an integer target, write a function to search target in nums.
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Minimum Depth of Binary Tree
Minimum Depth of Binary Tree: Given a binary tree, find its minimum depth.
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Average of Levels in Binary Tree
Average of Levels in Binary Tree: Given the root of a binary tree, return the average value of the nodes on each level in the form of an array.