随笔分类 - leetcode刷题
摘要：Reverse a singly linked list.代码如下：the iterative solution：（c++）/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNo...
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摘要：Givenn, how many structurally uniqueBST's(binary search trees) that store values 1...n?For example,Givenn= 3, there are a total of 5 unique BST's. 1...
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摘要：Invert a binary tree. 4 / \ 2 7 / \ / \1 3 6 9to 4 / \ 7 2 / \ / \9 6 3 1即反转二叉树，代码如下：/** * Definition for a bina...
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摘要：Given a column title as appear in an Excel sheet, return its corresponding column number.For example: A -> 1 B -> 2 C -> 3 ... Z -> 26 ...
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摘要：The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ...1is read off as"one 1"or11.11is read off as"tw...
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摘要：Find the total area covered by tworectilinearrectangles in a2Dplane.Each rectangle is defined by its bottom left corner and top right corner as shown ...
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摘要：要求：Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive inte...
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摘要：Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-nega...
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摘要：Implementatoito convert a string to an integer.Hint:Carefully consider all possible input cases.Notes:It is intended for this problem to be specified ...
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