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一、2Sum思路1：首先对数组排序。不过由于最后返回两个数字的索引，所以需要事先对数据进行备份。然后采用2个指针l和r，分别从左端和右端向中间运动：当l和r位置的两个数字之和小于目标数字target时，r减1；当l和r位置的两个数字之和大于目标数字target时，l加1。因此只需扫描一遍数组就可以检... 阅读全文
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题目：Given an arraySofnintegers, are there elementsa,b,cinSsuch thata+b+c= 0? Find all unique triplets in the array which gives the sum of zero.Note:Ele... 阅读全文
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题目：Given an arraySofnintegers, are there elementsa,b,c, anddinSsuch thata+b+c+d= target? Find all unique quadruplets in the array which gives the sum ... 阅读全文
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Best Time to Buy and Sell Stock I题目：Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to ... 阅读全文
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题目：Givennnon-negative integersa1,a2, ...,an, where each represents a point at coordinate (i,ai).nvertical lines are drawn such that the two endpoints ... 阅读全文
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题目：Suppose a sorted array is rotated at some pivot unknown to you beforehand.(i.e.,0 1 2 4 5 6 7might become4 5 6 7 0 1 2).Find the minimum element.Yo... 阅读全文
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题目：A peak element is an element that is greater than its neighbors.Given an input array wherenum[i] ≠ num[i+1], find a peak element and return its ind... 阅读全文
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今天做项目中，用background显示了二维码和一些文字，但显示到页面上时，二维码和图片都变得模糊了。于是将图片调整、放大，但在放大后，作为背景图片的它则显示不全，无奈之下用了backgroung-size。但background-size在IE下不兼容，故最后使用了img+width+hei... 阅读全文
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题目：According to theWikipedia's article: "TheGame of Life, also known simply asLife, is a cellular automaton devised by the British mathematician John ... 阅读全文
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题目：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 max... 阅读全文
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一、什么是层叠上下文和层叠水平层叠上下文和层叠水平有一点儿抽象。我们可以吧层叠上下问想象成一张桌子，如果有另一个桌子在他旁边，则代表了另一个层叠上下文。Stacking context 1由文件根元素构建，Stacking context 2和Stacking context 3是在Stacking... 阅读全文
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题目：Given an integer array of sizen, find all elements that appear more than⌊ n/3 ⌋times. The algorithm should run in linear time and in O(1) space.思路：... 阅读全文
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题目：Find the contiguous subarray within an array (containing at least one number) which has the largest product.For example, given the array[2,3,-2,4],... 阅读全文
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题目：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... 阅读全文
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题目：Given amxngrid filled with non-negative numbers, find a path from top left to bottom right whichminimizesthe sum of all numbers along its path.Note... 阅读全文