随笔分类 - Leetcode+题
摘要：Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Some hints: Could negative integers be palindromes?
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摘要：Given an array and a value, remove all instances of that value in place and return the new length. The order of elements can be changed. It doesn't ma
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摘要：Given n non-negative integers a1 , a2 , ..., an , where each represents a point at coordinate (i, ai ). n vertical lines are drawn such that the two e
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摘要：Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of
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摘要：Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers.
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摘要：Given an unsorted integer array, find the first missing positive integer. For example,Given[1,2,0]return3,and[3,4,-1,1]return2. Your algorithm should
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摘要：Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possib
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摘要：Given two sorted integer arrays A and B, merge B into A as one sorted array. Note: You may assume that A has enough space to hold additional elements
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摘要：Follow up for "Remove Duplicates":What if duplicates are allowed at most twice? For example,Given sorted array A =[1,1,1,2,2,3], Your function should
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摘要：Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space fo
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摘要：Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red,
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摘要：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]. 题意：给定一系列区间，合
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摘要：Given an integer n, generate a square matrix filled with elements from 1 to n 2 in spiral order. For example,Given n =3, You should return the followi
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摘要：Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example,Given the following matrix: You s
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摘要：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? 方法一：常规思路： 将图
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摘要：Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties: Integers in each row are sorted f
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摘要：Given a number represented as an array of digits, plus one to the number. 题意：给定数以数组的形式存储，然后计算该数加1的值。 思路：一般遇到这种以数组,或字符串形式的数相加的问题，都是从右往左遍历（因为，数的低位在右边），用
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摘要：Given an array where elements are sorted in ascending order, convert it to a height balanced BST. 题意：将已排序的数组转成高度平衡的搜索二叉树。 思路：这题和Convert sorted list to
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摘要：Say you have an array for which the i th element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may compl
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摘要：Say you have an array for which the i th element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may compl
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