I'd like to paste all my data I stored in several QList variables into one central QTableWidget.
I have six QList<QString> variables with actually each length of them is 7.
With the help of this routine, I'd like to write each element of my QList into a QTableWidgetItem. What is the easiest and efficient way to solve this?
for (int ridx = 0; ridx < iRowCount; ridx++ )
{
tmptable = resultTable[ridx];
for (int cidx = 0; cidx < iColumnCount; cidx++)
{
QTableWidgetItem* item = new QTableWidgetItem();
item->setText(tmptable[ridx]);
ui->tableWidget->setItem(ridx,cidx,item);
}
}
I got it running.
This is my final code to add all elements of each QList into the central QTableWidget. It's not that elegant solution. Might be there another (better) solution?
for (int cidx = 0; cidx < iColumnCount; cidx++)
{
if (cidx==0)
{
// Column LoginName
for (int ridx = 0 ; ridx < iRowCount ; ridx++ )
{
QTableWidgetItem* item = new QTableWidgetItem();
item->setText(ListLoginName[ridx]);
ui->tableWidget->setItem(ridx,cidx,item);
}
}
if (cidx==1)
{
//Column Lastname
for (int ridx = 0 ; ridx < iRowCount ; ridx++ )
{
QTableWidgetItem* item = new QTableWidgetItem();
item->setText(ListLastname[ridx]);
ui->tableWidget->setItem(ridx,cidx,item);
}
}
if (cidx==2)
{
// Column Firstname
for (int ridx = 0 ; ridx < iRowCount ; ridx++ )
{
QTableWidgetItem* item = new QTableWidgetItem();
item->setText(ListFirstname[ridx]);
ui->tableWidget->setItem(ridx,cidx,item);
}
}
if (cidx==3)
{
// COlumn Position
for (int ridx = 0 ; ridx < iRowCount ; ridx++ )
{
QTableWidgetItem* item = new QTableWidgetItem();
item->setText(ListPosition[ridx]);
ui->tableWidget->setItem(ridx,cidx,item);
}
}
if (cidx==4)
{
// Column Email
for (int ridx = 0 ; ridx < iRowCount ; ridx++ )
{
QTableWidgetItem* item = new QTableWidgetItem();
item->setText(ListEmail[ridx]);
ui->tableWidget->setItem(ridx,cidx,item);
}
}
if (cidx==5)
{
// Column Telephone
for (int ridx = 0 ; ridx < iRowCount ; ridx++ )
{
QTableWidgetItem* item = new QTableWidgetItem();
item->setText(ListTelephone[ridx]);
ui->tableWidget->setItem(ridx,cidx,item);
}
}
}
Related
Given two integer vectors A and B, we have to pick one element from each vector such that their xor is maximum and we need to return this maximum xor value from the function int Solution::solve(vector &A, vector &B).
I found out that the code below is not passing all the test cases when I'm declaring and initializing the head pointer globally right beneath the class Trienode. Why is that?
Code
class Trienode
{
public:
Trienode* left;
Trienode* right;
Trienode()
{
left=0;
right=0;
}
};
// Trienode* head = new Trienode;
int Max_Xor_Pair(Trienode* head, vector<int> B)
{
int n=B.size();
int max_xor=INT_MIN;
for(int i=0; i<n; i++)
{
int pair1 = B[i];
int pair2 = 0;
Trienode* curr=head;
for(int j=31; j>=0; j--)
{
int bit = (pair1>>j)&1;
if(bit)
{
if(curr->left)
curr=curr->left;
else
{
curr=curr->right;
pair2 += pow(2,j);
}
}
else
{
if(curr->right)
{
curr=curr->right;
pair2 += pow(2,j);
}
else
curr=curr->left;
}
}
int curr_xor = pair1 ^ pair2;
max_xor = max(max_xor, curr_xor);
}
return max_xor;
}
void Insert(Trienode* head, int num)
{
Trienode* curr=head;
for(int i=31; i>=0; i--)
{
int x = num;
int bit= (x>>i)&1;
if(bit)
{
if(!curr->right)
{
Trienode* temp = new Trienode;
curr->right=temp;
}
curr=curr->right;
}
else
{
if(!curr->left)
{
Trienode* temp = new Trienode;
curr->left=temp;
}
curr=curr->left;
}
}
}
int Solution::solve(vector<int> &A, vector<int> &B) {
Trienode* head = new Trienode;
for(int x:A)
Insert(head,x);
return Max_Xor_Pair(head,B);
}
Sample Input
A : [ 15891, 6730, 24371, 15351, 15007, 31102, 24394, 3549, 19630, 12624, 24085, 19955, 18757, 11841, 4967, 7377, 13932, 26309, 16945, 32440, 24627, 11324, 5538, 21539, 16119, 2083, 22930, 16542, 4834, 31116, 4640, 29659, 22705, 9931, 13978, 2307, 31674, 22387, 5022, 28746, 26925, 19073, 6271, 5830, 26778, 15574, 5098, 16513, 23987, 13291, 9162 ]
B : [ 18637, 22356, 24768, 23656, 15575, 4032, 12053, 27351, 1151, 16942 ]
When head is a global variable, and you don't have this line in Solution::solve:
Trienode* head = new Trienode;
...then head will retain its value after the first test case has finished, and so the second test case will not start with an empty tree. Each test case will add more nodes to the one tree. Of course this means that, except for the first test case, the tree rooted by head is not the intended tree.
To make the version with the global variable work, reset it in Solution::solve:
head->left = head->right = nullptr;
BTW, you should also initialise these members with nullptr (instead of 0) in your TrieNode constructor. This better reflects the intent.
You can also go with this approach:
Code:
struct Node {
Node* left;
Node* right;
};
class MaxXorHelper{
private : Node* root;
public :
MaxXorHelper() {
root = new Node();
}
void addElements(vector<int> &arr) {
for(int i=0; i<arr.size(); i++) {
Node* node = root;
int val = arr[i];
for(int j=31; j>=0; j--) {
int bit = (val >> j) & 1;
if(bit == 0) {
if(!node->left) {
node->left = new Node();
}
node = node->left;
}
else {
if(!node->right) {
node->right = new Node();
}
node = node->right;
}
}
}
}
int findMaxXor(vector<int> &arr) {
int maxXor = INT_MIN;
for(int i=0; i<arr.size(); i++) {
Node* node = root;
int val2 = 0;
int val1 = arr[i];
for(int j=31; j>=0; j--) {
int bit = (val1 >> j) & 1;
if(bit == 0) {
if(node->right) {
val2 |= (1 << j);
node = node->right;
} else{
node = node->left;
}
}
else {
if(node->left) {
node = node->left;
} else{
val2 |= (1 << j);
node = node->right;
}
}
}
int curXor = val1 ^ val2;
maxXor = max(maxXor, curXor);
}
return maxXor;
}
};
int Solution::solve(vector<int> &A, vector<int> &B) {
MaxXorHelper helper;
helper.addElements(A);
return helper.findMaxXor(B);
}
I'm new at this, I´m creating a field that solves N x N Matrixes, and I want the spinner to add more TextFields every time I change its value, so the user can select the size of the matrix and then solve it...However I don't know how to do this.
I've tried to attach a listener JavaFX spinner but it didn't work, and it has created some errors in the code.
The code in question...
public static void main(String[] args) {
// TODO Auto-generated method stub
launch(args);
}
public void start(Stage primaryStage) throws Exception{
Double[][] A = new Double[6][6];
Label tamanoML = new Label("Tamaño Matriz:");
Spinner tamanoMS =new Spinner(1,5,0,1);
int tamano=(int) tamanoMS.getValue();
int r;
Label[] campoL = new Label[6];
TextField campo [][] = new TextField[6][6];
Button resolverB = new Button("Resolver matrix");
resolverB.setOnAction((ActionEvent t) -> {
int n=(int) tamanoMS.getValue();
int cont=0;
for(int i=0; i<n; i++) {
for(int j=0; j<n+1; j++) {
A[i][j]=Double.parseDouble(campo[i][j].getText());
}
}
for (int a = 0; a < n; a++) {
Double temp = 0.0;
temp = A[cont][cont];
for (int y = 0; y < (n + 1); y++) {
A[cont][y] = A[cont][y] / temp;
}
for (int x = 0; x < n; x++) {
if (x!=cont) {
Double c = A[x][cont];
for (int z = 0; z < (n + 1); z++) {
A[x][z] = ((-1 * c) * A[cont][z]) + A[x][z];
}
}
}
cont++;
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < n+1; j++) {
campo[i][j].setText(""+A[i][j]);
}
}
});
Button limpiarb = new Button("Limpiar");
limpiarb.setOnAction((ActionEvent t) -> {
for(int i=0; i<tamano+1; i++) {
for(int j=0; j<tamano+1; j++) {
campo[i][j].setText("0");
}
}
});
GridPane mainPane = new GridPane();
mainPane.setMinSize(650,350);
mainPane.setPadding(new Insets(10,10,10,10));
mainPane.setVgap(5);
mainPane.setHgap(5);
mainPane.setAlignment(Pos.CENTER);
mainPane.add(tamanoML, 0, 0);
mainPane.add(tamanoMS, 1, 0);
mainPane.add(resolverB,0,1);
mainPane.add(limpiarb,1,1);
for(int i=0; i<tamano+1; i++) {
r=i+1;
if(r<tamano+1) {
r=i+1;
campoL[i]=new Label("X"+r);
mainPane.add(campoL[i],i,2);
}else {
campoL[i]=new Label("R");
mainPane.add(campoL[i],i,2);
}
}
for(int i=0; i<tamano; i++) {
for(int j=0; j<tamano+1; j++) {
campo[i][j] = new TextField("0");
mainPane.add(campo[i][j],j,i+3);
}
}
tamanoMS.valueProperty().addListener((newValue) -> {
int s;
for(int i=0; i<tamano+1; i++) {
s=i+1;
if(s<tamano+1) {
s=i+1;
campoL[i]=new Label("X"+s);
mainPane.add(campoL[i],i,2);
}else {
campoL[i]=new Label("R");
mainPane.add(campoL[i],i,2);
}
}
for(int i=0; i<tamano; i++) {
for(int j=0; j<tamano+1; j++) {
campo[i][j] = new TextField("0");
mainPane.add(campo[i][j],j,i+3);
}
}
s=0;
});
Scene scene = new Scene(mainPane);
primaryStage.setScene(scene);
primaryStage.setTitle("Ventas del Dia");
primaryStage.show();
}
Ok so the first thing you want to do is rewrite your listener like this
tamanoMS.valueProperty().addListener((obs, oldValue, newValue) -> {
System.out.println("heard");
int s;
for(int i=0; i<newValue+1; i++) {
s=i+1;
if(s<newValue+1) {
s=i+1;
campoL[i]=new Label("X"+s);
mainPane.add(campoL[i],i,2);
}else {
campoL[i]=new Label("R");
mainPane.add(campoL[i],i,2);
}
}
for(int i=0; i<newValue; i++) {
for(int j=0; j<newValue+1; j++) {
campo[i][j] = new TextField("0");
mainPane.add(campo[i][j],j,i+3);
}
}
s=0;
});
I'm gonna be honest I don't quite understand why you need oldValue and obs but you do. However, the reason your matrix wasn't expanding was because you weren't updating tamano to the most recent number.
You also need to change your spinner to this so that is know the value that is coming out is an integer.
Spinner<Integer> tamanoMS =new Spinner<Integer>(1,5,0,1);
Is there any alternative to System.Web.Security.Membership.GeneratePassword in AspNetCore (netcoreapp1.0).
The easiest way would be to just use a Guid.NewGuid().ToString("n") which is long enough to be worthy of a password but it's not fully random.
Here's a class/method, based on the source of Membership.GeneratePassword of that works on .NET Core:
public static class Password
{
private static readonly char[] Punctuations = "!##$%^&*()_-+=[{]};:>|./?".ToCharArray();
public static string Generate(int length, int numberOfNonAlphanumericCharacters)
{
if (length < 1 || length > 128)
{
throw new ArgumentException(nameof(length));
}
if (numberOfNonAlphanumericCharacters > length || numberOfNonAlphanumericCharacters < 0)
{
throw new ArgumentException(nameof(numberOfNonAlphanumericCharacters));
}
using (var rng = RandomNumberGenerator.Create())
{
var byteBuffer = new byte[length];
rng.GetBytes(byteBuffer);
var count = 0;
var characterBuffer = new char[length];
for (var iter = 0; iter < length; iter++)
{
var i = byteBuffer[iter] % 87;
if (i < 10)
{
characterBuffer[iter] = (char)('0' + i);
}
else if (i < 36)
{
characterBuffer[iter] = (char)('A' + i - 10);
}
else if (i < 62)
{
characterBuffer[iter] = (char)('a' + i - 36);
}
else
{
characterBuffer[iter] = Punctuations[i - 62];
count++;
}
}
if (count >= numberOfNonAlphanumericCharacters)
{
return new string(characterBuffer);
}
int j;
var rand = new Random();
for (j = 0; j < numberOfNonAlphanumericCharacters - count; j++)
{
int k;
do
{
k = rand.Next(0, length);
}
while (!char.IsLetterOrDigit(characterBuffer[k]));
characterBuffer[k] = Punctuations[rand.Next(0, Punctuations.Length)];
}
return new string(characterBuffer);
}
}
}
I've omitted the do...while loop over the CrossSiteScriptingValidation.IsDangerousString. You can add that back in yourself if you need it.
You use it like this:
var password = Password.Generate(32, 12);
Also, make sure you reference System.Security.Cryptography.Algorithms.
System.Random doesn't provide enough entropy when used for security reasons.
https://cwe.mitre.org/data/definitions/331.html
Why use the C# class System.Random at all instead of System.Security.Cryptography.RandomNumberGenerator?
Please see the example below for a more secure version of #khellang version
public static class Password
{
private static readonly char[] Punctuations = "!##$%^&*()_-+[{]}:>|/?".ToCharArray();
public static string Generate(int length, int numberOfNonAlphanumericCharacters)
{
if (length < 1 || length > 128)
{
throw new ArgumentException("length");
}
if (numberOfNonAlphanumericCharacters > length || numberOfNonAlphanumericCharacters < 0)
{
throw new ArgumentException("numberOfNonAlphanumericCharacters");
}
using (var rng = RandomNumberGenerator.Create())
{
var byteBuffer = new byte[length];
rng.GetBytes(byteBuffer);
var count = 0;
var characterBuffer = new char[length];
for (var iter = 0; iter < length; iter++)
{
var i = byteBuffer[iter] % 87;
if (i < 10)
{
characterBuffer[iter] = (char)('0' + i);
}
else if (i < 36)
{
characterBuffer[iter] = (char)('A' + i - 10);
}
else if (i < 62)
{
characterBuffer[iter] = (char)('a' + i - 36);
}
else
{
characterBuffer[iter] = Punctuations[GetRandomInt(rng, Punctuations.Length)];
count++;
}
}
if (count >= numberOfNonAlphanumericCharacters)
{
return new string(characterBuffer);
}
int j;
for (j = 0; j < numberOfNonAlphanumericCharacters - count; j++)
{
int k;
do
{
k = GetRandomInt(rng, length);
}
while (!char.IsLetterOrDigit(characterBuffer[k]));
characterBuffer[k] = Punctuations[GetRandomInt(rng, Punctuations.Length)];
}
return new string(characterBuffer);
}
}
private static int GetRandomInt(RandomNumberGenerator randomGenerator)
{
var buffer = new byte[4];
randomGenerator.GetBytes(buffer);
return BitConverter.ToInt32(buffer);
}
private static int GetRandomInt(RandomNumberGenerator randomGenerator, int maxInput)
{
return Math.Abs(GetRandomInt(randomGenerator) % maxInput);
}
}
I have tried following code but it writes in vertical way.How can i add 2d array into my listbox
for (int i = 0; i < test.GetLength(0); i++)
{
for (int j = 0; j < test.GetLength(1); j++)
{
ListBox3.Items.Add("-" + test[i, j].ToString());
}
ListBox3.Items.Add("\n");
}
}
This may help you from what I understand from your query;
string listboxstr = "";
for (int i = 0; i < test.GetLength(0); i++)
{
listboxstr = "" + test[i, 0].ToString();
for (int j = 1; j < test.GetLength(1); j++)
{
listboxstr +="-" + test[i, j].ToString();
}
ListBox3.Items.Add(listboxstr);
ListBox3.Items.Add("\n");
}
}
A simple query , i want to populate the dropdownlist with number starting from 17 to 90 , and the last number should be a string like 90+ instead of 90. I guess the logic will be using a for loop something like:
for (int a = 17; a <= 90; a++)
{
ddlAge.Items.Add(a.ToString());
}
Also I want to populate the text and value of each list item with the same numbers.
Any ideas?
for (int i = 17; i < 90; i++)
{
ddlAge.Items.Add(new ListItem(i.ToString(), i.ToString()));
}
ddlAge.Items.Add(new ListItem("90+", "90"));
Try this:
for (int a = 17; a <= 90; a++)
{
var i = (a == 90 ? a.ToString() + '+': a.ToString());
ddlAge.Items.Add(new ListItem(i, i));
}
This is easy enough. You need to instantiate the ListItem class and populate its properties and then add it to your DropDownList.
private void GenerateNumbers()
{
// This would create 1 - 10
for (int i = 1; i < 11; i++)
{
ListItem li = new ListItem();
li.Text = i.ToString();
li.Value = i.ToString();
ddlAge.Items.Add(li);
}
}
for (int a = 17; a <= 90; a++)
{
ddlAge.Items.Add(new ListItem(a.ToString(), a.ToString()));
}
for (int i = 17; i <= 90; i++)
{
ddlAge.Items.Add(new ListItem(i.ToString(), i.ToString()));
}
ddlAge.Items.Insert(0, new ListItem("Select Age", "0")); //First Item
ddlAge.Items.Insert(ddlAge.Items.Count, new ListItem("90+", "90+")); //Last Item
for (int i = 0; i <=91; i++)
{
if (i == 0)
{
ddlAge.Items.Add("Select Age");
}
else if(i<=90)
{
ddlAge.Items.Add(i.ToString());
i++;
}
else
{
ddlAge.Items.Add("90+");
}
}