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leetcode-8

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请你来实现一个 atoi 函数，使其能将字符串转换成整数。首先，该函数会根据需要丢弃无用的开头空格字符，直到寻找到第一个非空格的字符为止。当我们寻找到的第一个非空字符为正或者负号时，则将该符号与之后面尽可能多的连续数字组合起来，作为该整数的正负号；假如第一个非空字符是数字，则直接将其与之后连续的数字字符组合起来，形成整数。该字符串除了有效的整数部分之后也可能会存在多余的字符，这些字符可以被忽略，它们对于函数不应该造成影响。注意：假如该字符串中的第一个非空格字符不是一个有效整数字符、字符串为空或字符串仅包含空白字符时，则你的函数不需要进行转换。在任何情况下，若函数不能进行有效的转换时，请返回 0。说明：假设我们的环境只能存储 32 位大小的有符号整数，那么其数值范围为 [−231, 231 − 1]。如果数值超过这个范围，请返回 INT_MAX (231 − 1) 或 INT_MIN (−231) 。示例 1: 输入: "42" 输出: 42 示例 2: 输入: " -42" 输出: -42 解释: 第一个非空白字符为 '-', 它是一个负号。我们尽可能将负号与后面所有连续出现的数字组合起来，最后得到 -42 。示例 3: 输入: "4193 with words" 输出: 4193 解释: 转换截止于数字 '3' ，因为它的下一个字符不为数字。示例 4: 输入

bind character vector to list into dataframe

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问题 I have a list of URLs and have extracted the content as follows: library(httr) link="http://www.workerspower.net/disposable-workers-the-real-price-of-sweat-shop-labor" get.link=GET(link) get.content=content(x2,as="text") extract.content=str_extract_all(y2,"<p>(.*?)</p>") This gives a "list of 1" with text. The length of each list is dependent on/varies with the URL. I would like to bind the URL [link] with the content [extract.content] and transform it into a dataframe and then import that

Python: Invalid Literal for Int() Base 10

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问题 I'm writing code for a project to determine the validity of credit cards and i've hit a wall, it seems like all of the things i have tried so far are not working. This is giving me an error for the sumofodds function where j=int(card[i]) The error is "Invalid Literal for Int() with Base 10 Is there anyone that can give me some advce? def sumofdoubles(): card=input() x=len(card) summ=0 for i in range(x-2,-1,-2): j=int(card[i]) u=j+j if u>9: h=u/2 summ=summ+h return(summ) def sumofevens(): card

Assembly Conversion any base to any base

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问题 i'm doing a program to input a number and base, and convert this number to any base. In this initial fase, i get from the user the number and base, the question is.. How i can verify if the number is from that base? NUMBER_INPUT PROC jmp @again @ERROR: LEA DX, ILLEGAL MOV AH, 9 INT 21H @AGAIN: print num MOV CX, 8 XOR BX, BX MOV AH, 1 @INPUT: INT 21H CMP AL, 0DH JE @END CMP AL, 30H JL @ERROR ; CMP AL, 31H ; JG @ERROR AND AL, 0FH SHL BX, 1 OR BL, AL LOOP @INPUT @END: RET NUMBER_INPUT ENDP BASE

Return base class in C#

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问题 How can i return data that is in base class form? A aclass = new A(); B bclass = aclass.GetB(); does not work. public class B { protected string str1; protected string str2; } public class A:B { public A() { base.str1 = "A"; base.str2 = "B"; } public B GetB() { return base; } } 回答1: GetB() is completely unnecessary. B bclass = aclass; is sufficient as aclass is already a B . 回答2: I'm no C# expert, but return this; should work. I really don't see the point in doing this though. 回答3: I strongy

save base64 image python

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问题 I am trying to save an image with python that is Base64 encoded. Here the string is to large to post but here is the image And when received by python the last 2 characters are == although the string is not formatted so I do this import base64 data = "data:image/png;base64," + photo_base64.replace(" ", "+") And then I do this imgdata = base64.b64decode(data) filename = 'some_image.jpg' # I assume you have a way of picking unique filenames with open(filename, 'wb') as f: f.write(imgdata) But

C# Creating a Base Form with Custom Properties

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问题 I am having a small issue where the defined custom property value is not sticking in the inherited form. The code in my base form is: namespace ContractManagement.Forms { public partial class BaseForm : Form { public BaseForm() { InitializeComponent(); } public Boolean DialogForm { get { return TitleLabel.Visible; } set { TitleLabel.Visible = value; CommandPanel.Visible = value; } } protected override void OnTextChanged(EventArgs e) { base.OnTextChanged(e); TitleLabel.Text = Text; } } } Then

Convert Integer to Generic Base Matlab

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问题 I'm trying to convert a base-10 integer k into a base-q integer, but not in the standard way. Firstly, I'd like my result to be a vectors (or a string 'a,b,c,...' so that it can be converted to a vector, but not 'abc...'). Most importantly, I'd like each 'digit' to be in base-10. As an example, suppose I have the number 23 (in base-10) and I want to convert it to base-12. This would be 1B in the standard 1,...,9,A,B notation; however, I want it to come out as [1, 11]. I'm only interested in

Shell: In-file converting first field of a text file from decimal to hexadecimal

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问题 This is my example text file: $ cat RealVNC\ MRU.reg "10"="Lamborghini-:1" "16"="Terminus-" "20"="Midnighter-:5915" "35"="ThreepWood-:1" "81"="Midnighter-:1" "58"="Midnighter-" And I would like to convert values of the first field (the numbers between "" ) from decimal to hexadecimal (it is a .reg file for Windows, so I meesed it up thinking the numbers were in a decimal base, and now the file is too long to manually edit). Example result that I need to obtain: $ cat Hex\ RealVNC\ MRU.reg "0A

Why does Chrome produce 1099 digits after the dot for (.1).toString(3)?

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问题 I have a feeling that this is a just a harmless bug but I'd still like to understand what's going on. I was playing with some code to render a Peano curve on a canvas that involves expressing logical coordinates in base 3 when I noticed that a function was returning absurdly long strings in Chrome. Looking more closely, it turns out that the expression (.1).toString(3) evaluates in Chrome to 0