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Problem Definition:Given a binary tree, determine if it is height-balanced.For this problem, a height-balanced binary tree is defined as abinary tree ... 阅读全文
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Problem Definition:Given a binary tree, find its minimum depth.The minimum depth is the number of nodes along the shortest path from the root node dow... 阅读全文
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Problem Definition: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 equa... 阅读全文
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Problem Definition: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 yo... 阅读全文
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Problem Definition:Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return[ [1], [1,1], [1,2,1]... 阅读全文
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Problem Definition:Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a... 阅读全文