摘要： 题目： Determine whether an integer is a palindrome. Do this without extra space. Some hints: Could negative integers be palindromes? (ie, -1) If you are 阅读全文

摘要： 题目： Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see be 阅读全文

摘要： 题目： Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 思路：不断取最低位加到先前值得后面，如下： while(x!=0){ res=res*10+x%10; x/ 阅读全文

摘要： 题目： 思路： 以图为例：s={'A','B','C','D','E','F','G','H'.....} 1.先不考虑中间元素F、G、H、N...，每一行前后元素在数组中对应下标相差size=2*numRows-2(其中numRows是行数) 例如：第1行起始元素s[0]=A，在不大于数组长度情况 阅读全文

摘要： 题目： Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique lo 阅读全文

摘要： 题目： There are two sorted arrays nums1 and nums2 of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexit 阅读全文

摘要： 题目： Given a string, find the length of the longest substring without repeating characters. Examples: Given "abcabcbb", the answer is "abc", which the 阅读全文

摘要： 题目： You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a sin 阅读全文