golang小数默认是float32还是float64?

price := 0.01

Dablelv 实测为float64
8 个月之前 回复

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Golang 返回树状结构 这个结构是append吗
Golang 返回树状结构 这个结构是append吗，如果不是的话是什么？
Regular Polygon 多边形怎么来写
Problem Description In a 2_D plane, there is a point strictly in a regular polygon with N sides. If you are given the distances between it and N vertexes of the regular polygon, can you calculate the length of reguler polygon's side? The distance is defined as dist(A, B) = sqrt( (Ax-Bx)*(Ax-Bx) + (Ay-By)*(Ay-By) ). And the distances are given counterclockwise. Input First a integer T (T≤ 50), indicates the number of test cases. Every test case begins with a integer N (3 ≤ N ≤ 100), which is the number of regular polygon's sides. In the second line are N float numbers, indicate the distance between the point and N vertexes of the regular polygon. All the distances are between (0, 10000), not inclusive. Output For the ith case, output one line “Case k: ” at first. Then for every test case, if there is such a regular polygon exist, output the side's length rounded to three digits after the decimal point, otherwise output “impossible”. Sample Input 2 3 3.0 4.0 5.0 3 1.0 2.0 3.0 Sample Output Case 1: 6.766 Case 2: impossible
Weapon 的问题
Problem Description 　　Doctor D. are researching for a horrific weapon. The muzzle of the weapon is a circle. When it fires, rays form a cylinder that runs through the circle verticality in both side. If one cylinder of rays touch another, there will be an horrific explosion. Originally, all circles can rotate easily. But for some unknown reasons they can not rotate any more. If these weapon can also make an explosion, then Doctor D. is lucky that he can also test the power of the weapon. If not, he would try to make an explosion by other means. One way is to find a medium to connect two cylinder. But he need to know the minimum length of medium he will prepare. When the medium connect the surface of the two cylinder, it may make an explosion. Input 　　The first line contains an integer T, indicating the number of testcases. For each testcase, the first line contains one integer N(1 < N < 30), the number of weapons. Each of the next 3N lines&nbsp; contains three float numbers. Every 3 lines represent one weapon. The first line represents the coordinates of center of the circle, and the second line and the third line represent two points in the circle which surrounds the center. It is supposed that these three points are not in one straight line. All float numbers are between -1000000 to 1000000. Output 　　For each testcase, if there are two cylinder can touch each other, then output 'Lucky', otherwise output then minimum distance of any two cylinders, rounded to two decimals, where distance of two cylinders is the minimum distance of any two point in the surface of two cylinders. Sample Input 3 3 0 0 0 1 0 0 0 0 1 5 2 2 5 3 2 5 2 3 10 22 -2 11 22 -1 11 22 -3 3 0 0 0 1 0 1.5 1 0 -1.5 112 115 109 114 112 110 109 114 111 -110 -121 -130 -115 -129 -140 -104 -114 -119.801961 3 0 0 0 1 0 1.5 1 0 -1.5 112 115 109 114 112 110 109 114 111 -110 -121 -130 -120 -137 -150 -98 -107 -109.603922 Sample Output Lucky 2.32 Lucky

Problem Description Desolators are the elite troops of the WHU army in the alternate world of ICPC. When the Desolator plant a powerful Radiation Cannon in the ground, the cannon emits a radiation field over a circular area with radius R, poisoning everything within the circle (including boundary).The desolator must remain immobile while using this attack; if he wishes to move he has to uproot the cannon, disabling the radiation field. To protect desolator himself from the harm of radiation, the Desolator wears an armored Radiation suit. This suit is protected against the radiation emitted by the cannon. There are N enemies need to be destroyed. Each enemy can be destroyed if their total attacked times reach a certain value. Fortunately we know that value for each enemy. Our honored desolator FreeRadiant is executing this mission. He can use his cannon freely: e.g. plant it somewhere, wait for some time, uproot it and plant it somewhere else again and so on. The Desolator is so fast that planting, uprooting and moving the cannon takes no time, only the poisoning time matters. He just wants to know the total time needed in which he has to plant the cannon into the ground. Input The first line consists of an integer of T, indicating the test cases in the file. Each case begins with two integers, N and R, indicating the number of enemies and the radius of the circle. The next N lines, each line consists of two integers Xi, Yi, Pi, indicating the coordinate and the time needed to destroy each enemy. Output Output one float number rounded to 2 fractional digits, indicating the minimum time for the cannon needs to be planted in the ground. Constrains T <= 20 0 < N <= 100 0 < R <= 10000 0 <= Xi, Yi, Pi <= 10000 Sample Input 2 4 1 1 1 3 1 -1 3 -1 1 3 -1 -1 3 5 1 100 100 10000 1 1 3 1 -1 3 -1 1 3 -1 -1 3 Sample Output 6.00 10006.00

Golang 如何进行标准错误输出

Problem Description 输入一个英文句子，将每个单词的第一个字母改成大写字母。 Input 输入数据包含多个测试实例，每个测试实例是一个长度不超过100的英文句子，占一行。 Output 请输出按照要求改写后的英文句子。 Sample Input i like acm i want to get an accepted Sample Output I Like Acm I Want To Get An Accepted
Allergy Test 代码设计问题
Problem Description A test for allergy is conducted over the course of several days, and consists of exposing you to dierent substances (so called allergens). The goal is to decide exactly which of the allergens you are allergic to. Each allergen has a live duration D measured in whole days, indicating exactly how many days you will suer from an allergic reaction if you are allergic to that particular substance. An allergic reaction starts to show almost immediately after you have been exposed to an allergen which you are allergic to. The test scheme has two action points per day: I At 8 o'clock each morning, at most one of the allergens is applied to your body. II At 8 o'clock each evening, you are examined for allergic reactions. Thus an allergen with live duration D will aect exactly D allergic reaction examinations. Of course, if you have two or more active allergens in your body at the time of an observed reaction, you cannot tell from that information only, which of the substances you are allergic to. You want to find the shortest possible test scheme given the durations of the allergens you want to test. Furthermore, to allow simple large scale application the test scheme must be non-adaptive, i.e. the scheme should be fixed in advance. Thus you may not choose when to apply an allergen based on the outcome of previous allergic reaction examinations. Input The first line of the input contains a single integer k (1 <= k <= 20) specifying the number of allergens being tested for. Then follow k lines each containing an integer D (1 <= D <= 7) specifying the live duration of each allergen. Output The number of days of the shortest conclusive non-adaptive test scheme. A scheme ends the morning when you no longer have active allergens in your body, thus a test scheme for a single allergen with live duration D takes D days. Sample Input 3 2 2 2 5 1 4 2 5 2 Sample Output 5 10
TURBO C语言在Wendow 10上做程序开发，使用什么CUP才比较流程
TURBO C语言在Wendow 10上做程序开发，使用什么CUP才比较流程，用52640v2八核十六心够不够？
Shortest Path on a Cylinder 是怎么编写的呢
Sum of Cubes 程序怎么来编写
Problem Description According to Goldbach’s conjecture, every even number can be expressed as a sum of two odd primes. Which numbers can be expressed as the sum of two cubes? Input For each test case, a line will contain a positive integer n which will be at most one million. The last line will contain the integer 0, which should not be processed. Output For each test case, output two integers x and y such that x3 + y3 = n. If there are many such pairs of numbers, choose x to be as small as possible. If there are no such pairs, output “Impossible”. Sample Input 1 2 3 1000000 0 Sample Output 0 1 1 1 Impossible 0 100

Burning 是怎么来写的呢
Problem Description The sky is BURNING,and you find there are n triangles on a plane. For every point p,if there's exactly k triangles contains it,then define it's thickness as k. For every i from 1 to n,calculate the area of all points whose thickness is i. Input The first line contains integer T(T <= 5),denote the number of the test cases. For each test cases,the first line contains integer n(1 <= n <= 50),denote the number of the triangles. Then n lines follows,each line contains six integers x1, y1, x2, y2, x3, y3, denote there's a triangle with vertices (x1, y1), (x2, y2), (x3, y3). 0 <= xi, yi <= 100 for every i. Output For each test cases,print n lines,the i-th is the total area for thickness i. The answer will be considered correct if its absolute error doesn't exceed 10-4. Sample Input 1 5 29 84 74 64 53 66 41 49 60 2 23 38 47 21 3 58 89 29 70 81 7 16 59 14 64 62 63 2 30 67 Sample Output 1348.5621251916 706.2758371223 540.0414504206 9.9404623255 0.0000000000
golang中使用walk展示二维码图片
![图片说明](https://img-ask.csdn.net/upload/201912/17/1576568318_853567.png) **我的需求是点击生成二维码 在下面展示二维码。 **部分代码如下，初学golang 请教各位大佬** ``` type MyMainWindow struct { *walk.MainWindow hcName *walk.Label userIdName *walk.Label startTime *walk.DateEdit endTime *walk.DateEdit hc, userId *walk.LineEdit imageView *walk.ImageView imageComposite *walk.Composite qrCount int } func (mw *MyMainWindow) ShowQRcode() { if mw.imageComposite != nil { mw.imageComposite.Dispose() } mw.getQRcode() widgets := []Widget{} for i:=1;i<=mw.qrCount;i++ { bitmap, err := walk.NewBitmapFromFile("qrcode/qr_"+strconv.Itoa(i)+".jpg") log.Println("qrcode/qr_"+strconv.Itoa(i)+".jpg") if err != nil { walk.MsgBox(mw, mw.Title(), err.Error(), walk.MsgBoxIconError) break } widget := ImageView{ Image: bitmap, Mode: ImageViewModeZoom, } widgets = append(widgets, widget) } imageComposite := Composite{ AssignTo: &mw.imageComposite, Layout: HBox{}, Children: widgets, } if err := imageComposite.Create(NewBuilder(mw)); err != nil { log.Println(err) } } func openWindow(){ mw := &MyMainWindow{} _, _ = MainWindow{ Title: "梅清打印量上报", MinSize: Size{600, 400}, Size:Size{1200,800}, Layout: VBox{MarginsZero: true}, Children: []Widget{ Composite{ Layout:HBox{}, Children: []Widget{ Label{AssignTo: &mw.hcName,Text: "医院编号"}, LineEdit{AssignTo: &mw.hc,}, Label{AssignTo: &mw.userIdName,Text: "工程师编号"}, LineEdit{AssignTo: &mw.userId,}, DateEdit{AssignTo:&mw.startTime, Format:"yyyy-MM-dd",}, DateEdit{AssignTo:&mw.endTime, Format:"yyyy-MM-dd",}, PushButton{ Text: "生成二维码", OnClicked: func(){ if len(mw.hc.Text()) == 0 { walk.MsgBox(mw, mw.Title(), "请输入医院编号", walk.MsgBoxIconError) log.Println("请输入医院编号") return } if len(mw.userId.Text()) == 0 { walk.MsgBox(mw, mw.Title(), "请输入工程师编号", walk.MsgBoxIconError) log.Println("请输入工程师编号") return } mw.ShowQRcode() }, }, }, }, Composite{ AssignTo:&mw.imageComposite, Layout:HBox{}, }, }, }.Run() } ``` 这是报错信息 ![图片说明](https://img-ask.csdn.net/upload/201912/24/1577177949_302636.png)
FXTZ II
Problem Description Cirno is playing a fighting game called "FXTZ" with Sanae. Sanae is a ChuShou(master) of the game while Cirno is a ShaBao(noob). Since Cirno is a ShaBao, she just presses a random key on the keyboard for every 0.5 second, expecting to make a BiShaJi. The battle begins. Having tried exactly 9 times, she finally makes a BiShaJi! She find herself summoned N iceballs!!! Then Sanae's HP decreases to 0 immediately....It should have been like that. But Cirno is too simple, always navie. She doesn't know how to handle the iceballs, so she starts to press the keyboard at random, again. Let's see how the iceball damages. Each iceball has a fixed energy: the first ball's energy is 2^0, the second ball's energy is 2^1,..., and the N-th ball's energy is 2^(N-1). The damage caused by an iceball is equal to its energy. Cirno will shoot N times. Since Cirno is pressing the keyboard at random, each time Cirno will choose exactly one iceball with equal possibility to shoot out. Once shot out, the iceball can't be chosen again. And even worse, the target may be either her opponent or herself, with equal possibility(50%). What a big ShaBao she is. =_= During shooting, once Cirno's HP is less than Sanae's, she will lose the game. Otherwise, she wins. You may assume Sanae did nothing while Cirno's shooting(all damages are caused by Cirno's iceball), and their original HP are both 2^N (No one will die in the middle of the battle unless Cirno's HP is less than Sanae's). Here comes the question: Can you calculate the possibility of Cirno's victory? Input The first line an integer C (C<=30), the number of test cases. For each case, the only line contains one integer N(0<N<=500), indicating the number of iceballs. Output For each case output a fraction, the possibility of Cirno's victory. The fraction must be reduced. Sample Input 2 1 4 Sample Output 1/2 35/128
Attack 的程序编写技术
Problem Description Today is the 10th Annual of “September 11 attacks”, the Al Qaeda is about to attack American again. However, American is protected by a high wall this time, which can be treating as a segment with length N. Al Qaeda has a super weapon, every second it can attack a continuous range of the wall. American deployed N energy shield. Each one defends one unit length of the wall. However, after the shield defends one attack, it needs t seconds to cool down. If the shield defends an attack at kth second, it can’t defend any attack between (k+1)th second and (k+t-1)th second, inclusive. The shield will defend automatically when it is under attack if it is ready. During the war, it is very important to understand the situation of both self and the enemy. So the commanders of American want to know how much time some part of the wall is successfully attacked. Successfully attacked means that the attack is not defended by the shield. Input The beginning of the data is an integer T (T ≤ 20), the number of test case. The first line of each test case is three integers, N, Q, t, the length of the wall, the number of attacks and queries, and the time each shield needs to cool down. The next Q lines each describe one attack or one query. It may be one of the following formats 1. Attack si ti Al Qaeda attack the wall from si to ti, inclusive. 1 ≤ si ≤ ti ≤ N 2. Query p How many times the pth unit have been successfully attacked. 1 ≤ p ≤ N The kth attack happened at the kth second. Queries don’t take time. 1 ≤ N, Q ≤ 20000 1 ≤ t ≤ 50 Output For the ith case, output one line “Case i: ” at first. Then for each query, output one line containing one integer, the number of time the pth unit was successfully attacked when asked. Sample Input 2 3 7 2 Attack 1 2 Query 2 Attack 2 3 Query 2 Attack 1 3 Query 1 Query 3 9 7 3 Attack 5 5 Attack 4 6 Attack 3 7 Attack 2 8 Attack 1 9 Query 5 Query 3 Sample Output Case 1: 0 1 0 1 Case 2: 3 2

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