随笔分类 - LeetCode
摘要：题目链接Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not pos...
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摘要：题目链接 Given an unsorted integer array, find the first missing positive integer. For example, Given [1,2,0] return 3, and [3,4,-1,1] return 2. Your algorithm should run in O(n) time and uses con...
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摘要：题目链接 You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up: Could you do this in-place? ...
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摘要：题目链接The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed f...
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摘要：题目链接Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letter...
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摘要：题目链接 Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 Have you thought about this? Here are some good questions to ask before coding. Bonus points ...
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摘要：题目链接 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 single digit. Add the two numbers and return it as ...
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摘要：题目链接Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-...
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摘要：题目链接Given a stringsconsists of upper/lower-case alphabets and empty space characters' ', return the length of last word in the string.If the last word...
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摘要：题目链接The set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the following sequence...
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摘要：Jump Game Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that position. Dete...
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摘要：题目链接Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were ini...
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摘要：题目链接Given a collection of intervals, merge all overlapping intervals.For example, Given [1,3],[2,6],[8,10],[15,18], return [1,6],[8,10],[15,18].对若干...
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摘要：题目链接 Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [−2,1,−3,4,−1,2,1,−5,4], the contiguous subarray [4,−1,2...
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摘要：Unique PathsA robot is located at the top-left corner of amxngrid (marked 'Start' in the diagram below).The robot can only move either down or right a...
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摘要：题目链接Given a list, rotate the list to the right bykplaces, wherekis non-negative.For example:Given1->2->3->4->5->NULLandk=2,return4->5->1->2->3->NULL.首...
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摘要：题目链接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 bel...
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摘要：Search Insert PositionGiven a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if ...
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摘要：题目链接Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.For example:Input: ["tea","and","...
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摘要：题目链接Determine whether an integer is a palindrome. Do this without extra space.Some hints:Could negative integers be palindromes? (ie, -1)If you are th...
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