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摘要： Search for a Range问题leetcodejava二分查找 1. 问题描述Given an array of integers sorted in ascending order, find the starting and ending position of a given target value.Your algorithm's runtime complexity mu... 阅读全文

摘要： atoi问题leetcodejavaatoi 1.问题描述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 below and ask yourself wha... 阅读全文

摘要： Palindrome Number问题leetcodejava回文数 1.问题描述Determine whether an integer(整数) is a palindrome(回文). Do this without extra space.题目翻译：确定一个整数是不是回文数，不能使用额外的空间。 2.解题思路1.把整数直接转成字符串，然后把字符串reverse一下，比较两个字符是否相等... 阅读全文

摘要： Longest Palindromic Substring问题leetcodejavaDP 1.题目描述Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.Example:Input: "babad"Output: "... 阅读全文

摘要： twosum问题leetcodetwusumjava 1. 题目描述Given an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that each input would have exactly one solut... 阅读全文

摘要： longest substring问题最长子串滑动窗口HashMap 1.题目描述Given a string, find the length of the longest substring without repeating characters.Examples:Given "abcabcbb", the answer is "abc", which the length is 3.G... 阅读全文