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Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as a binary tree in which the depth... 阅读全文
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Given a binary tree, find its minimum depth.The minimum depth is the number of nodes along the shortest path from the root node down to the nearest le... 阅读全文
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Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.For example:Given the below binary tree and sum ... 阅读全文
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Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum.Fo... 阅读全文
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Given a binary tree, flatten it to a linked list in-place. For example,Given 1 / \ 2 5 / \ \ 3 4 6The flattened ... 阅读全文
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Follow up for problem "Populating Next Right Pointers in Each Node".What if the given tree could be any binary tree? Would your previous solution stil... 阅读全文
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Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1].Note:Could you optimize your algorithm to use... 阅读全文
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Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,... 阅读全文
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Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the fo... 阅读全文
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Given a binary tree, find the maximum path sum.The path may start and end at any node in the tree. For example:Given the below binary tree, 1 ... 阅读全文