is the action of adding an element at the end of a container.
push-back is the action of adding an element at the end of a container.
Questions tagged [push-back]
420 questions
0
votes
1 answer
How to fix this C++ code with runtime error malloc: sysmalloc: Assertion
So the problem is that this code gives malloc error when run. The input I give is n = 2, x = 4.
I think the problem is with vector pre because this happens when push_back is called.
int n, x;
cin>>n>>x;
n = (1< taken(n,…
Salmaan
- 31
- 8
0
votes
2 answers
How Vector allocation using push_back() and pop_back operation gives garbage values
I am solving a problem in which I have to find those element from the array whose total gives maximum sum. But there is a condition that no two adjacent element can be the part of that max subarray. Here is my code using simple brute Force…
T.g
- 169
- 2
- 11
0
votes
1 answer
Confused with loop and mutate vector in c++
#include
#include
using namespace std;
int main(int argc, const char *argv[]) {
vector v{0, 1, 2, 3, 4};
for (auto it = v.begin(), e = v.end(); it != e; ++it) {
const int x = *it;
cout << x << endl;
…
Xiong chenyu
- 135
- 1
- 9
0
votes
2 answers
Help with constructor (pusing_back elements into a pointer to an array)
I have a problem inserting elements into a pointer to a vector of some elements I defined in my code (in this case Recipes). In some other parts of the code, using push_back seems to work fine, but if I use it in this code:
{
Recipe…
Jota
- 234
- 2
- 11
0
votes
2 answers
C++ variable not passing it's value after push_back
I'm having a weird issue where the variables i'm declaring that are pushed back to a vector> are not being actually pushed back... Take a look:
vector Lignetemp;
for(int j = 0; j < InfoSup.nbL; j++){
Lignetemp.clear();
…
Falanpin
- 55
- 12
0
votes
1 answer
Union of two std::vector Read Access Violation
I have a union of two std::vectors and when I call push_back i get a read access violation. I'm pretty new to unions so I bet I'm doing something wrong with them. Any ideas why this is happening?
struct Row
{
char order_id[30];
char…
R. Binter
- 221
- 1
- 8
0
votes
1 answer
Appending a value to a nested QList
I am trying to append values to a QList inside another QList but it doesn't seem to work?
Here is a MCVE of my problem where I try to append int values:
#include
#include
int main(int argc, char *argv[]) {
QList>…
Matt
- 15
- 7
0
votes
1 answer
When i try to define this vector< pair< int , pair > > vp(n)
There's in output Give me 0 0
#include
#define fsv(i , n) for(int i = 0 ; i < n ; ++i)
using namespace std;
int main()
{
int n ;
cin >> n ;
vector< pair< int , pair > > vp(n);
vector v(n) ;
fsv(i ,…
Amir Haytham Salama
- 3
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- 3
0
votes
2 answers
How to set up vector of vector pairs?
In this code, I am trying to make a vector of vector pairs. The code compiles but it has a segmentation fault and I cannot figure out where I am going wrong. I would be grateful for any hint that can solve my problem.
#include
#include…
user143
- 19
- 5
0
votes
0 answers
cv::Mat pushback to std::vector issue
The goal is to read images from a basler camera (with pylon) to opencv matrix, and load that in a std::vector container with the push_back() method. My attempt fails as all the saved elements will be the last one. So if I push back 295 element, all…
Dániel Terbe
- 105
- 1
- 10
0
votes
1 answer
Vector Stack Pair | Longest path in a tree using dfs
#include
using namespace std;
vector adj(10001);
bool vis[10001];
void initialize ()
{
for (int i = 0; i<10001; i++)
vis[i] = false;
}
pair dfs ( int x )
{
stack < pair > s;
s.push(…
Jyotiraditya
- 1
- 3
0
votes
1 answer
What explains so many moves and destructions in this snippet
In order to understand the rule of five, I came up with this:
#include
#include
class A
{
public:
A(int y)
{
std::cout << "constructed\n";
x = new int[y];
}
~A()
{
std::cout << "destructed\n";
delete[]…
philips_dvd
- 83
- 8
0
votes
3 answers
vector within vector generates duplicate values in second dimension
In the example below (which can also be seen in Ideone), I have a vector of a class and inside the class I have an element also vector.
The problem is that when doing the push_back of the class, the internal vector vetint should start from the…
Rogério Dec
- 801
- 8
- 31
0
votes
2 answers
Writing my own push_back funtion
I have a simple c++ phonebook project, and I'm no allowed to use std::vector.
So i decided i create one for myself.
And I'd like to ask a little help about my push_back function.
So this is in the vector.h:
class Vector{
int siz; …
Ádám Szűcs
- 47
- 6
0
votes
2 answers
C++ Out Of Range When using Vector
So I have created a Binary Search Tree (BST) by placing nodes into a vector. These nodes store 3 values, a user input int ID, a user input int age, and a user string input name.
When inserting these nodes into the vector, they are stored going in…
Granzo
- 59
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- 7