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Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image. To flip an image horizontally means t 阅读全文
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International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: "a" maps to ".-", "b" map 阅读全文
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A valid parentheses string is either empty (""), "(" + A + ")", or A + B, where A and B are valid parentheses strings, and + represents string concate 阅读全文
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You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in S is a type of ston 阅读全文
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Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 whic 阅读全文
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Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted to complete at most one transaction 阅读全文
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You are given a perfect binary tree where all leaves are on the same level, and every parent has two children. The binary tree has the following defin 阅读全文
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Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. Note: A leaf is a node with no children. Exampl 阅读全文
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效果如下： 方法： 添加图片使用了<input>标签，将标签的type设置为file就可以点击打开文件夹添加文件了。 当前在页面表现为一个输入栏 如果不想要输入栏可以将其隐藏：将其display设置为none，并使用图片元素代替点击。相当于给点击选择文件换一种展现形式。 添加一个图片表示点击该图片添 阅读全文
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问题： H5网页在移动端浏览器上打开时过大，需要双击或者手动调整才能适配屏幕。效果如下： 问题的根本原因是：写网页的时候尺寸设置过大(･ัω･ั) 直接按照UI给的设计图上的尺寸设置后，整个页面变成了它本应该大小的2倍大。原因在于一般UI给的单位是物理像素，而css中的像素是一个抽象值，css中的1 阅读全文