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Given an array of numbersnums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements t... 阅读全文
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Reverse digits of an integer.Example1:x = 123, return 321Example2:x = -123, return -321click to show spoilers.Have you thought about this?Here are som... 阅读全文
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Given two binary strings, return their sum (also a binary string).For example,a ="11"b ="1"Return"100".思路：学习这种代码的简洁写法。 1 class Solution { 2 public: 3 ... 阅读全文
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Given two stringssandt, determine if they are isomorphic.Two strings are isomorphic if the characters inscan be replaced to gett.All occurrences of a ... 阅读全文
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Given apatternand a stringstr, find ifstrfollows the same pattern.Herefollowmeans a full match, such that there is a bijection between a letter inpatt... 阅读全文
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Find the total area covered by tworectilinearrectangles in a2Dplane.Each rectangle is defined by its bottom left corner and top right corner as shown ... 阅读全文
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Given a singly linked list, determine if it is a palindrome.Follow up:Could you do it in O(n) time and O(1) space?思路：将链表前半部分反转，对比就行了。 1 class Solution... 阅读全文