C++ :: Sequentially Remove One Element From Vector At A Time With Replacement?

Dec 8, 2014

I have a vector of int,

Code:
vector<int> row_numbers{1,2,3,4,5,6,7,8,9};

I want to sequentially remove one element at a time starting with the first. When the second element is removed, the first element needs to go back in. The sequence would look like

Code:
// original vector, row_numbers.size()=9
row_numbers{1,2,3,4,5,6,7,8,9};
// trimmed vector, row_numbers_trim.size()=8

[Code] .......

I have been working under the assumption that the best method would be to have row_numbers remain untouched and work on a copy. For each step in the sequence, you would create row_numbers_trim as a copy of row_numbers, and then remove an element from row_numbers_trim.

Code:
// position being removed
int counter = 0;
// copy original vector
row_numbers_trim = row_numbers;
// remove the first element from the copy
row_numbers_trim(row_numbers_trim.begin()+counter);

All you would have to do here is to increment counter in a loop. is there a better way?

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pop_back just returns void, so I just can't use that?

erase is okay but it doesn't return anything....

Do I use a combination of both?

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I am trying to pop the element on a vector off and return its value at the same time

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Is the only way to get the element and destroy it is to do this?

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I want to a C program to delete an element from an array which can use both index method & character method
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It should able to read in/accept any input array of varying length, and the position/index or element in array to be deleted...

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This is the code I am working on:

//player.cpp
void Player::CheckCollectableCollisions(std::list<Collectable>& c) {
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Jun 6, 2013

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Code: #include <iostream>
using namespace std;
struct EnemySpaceShip {
int x_coordinate;
int y_coordinate;

[Code]...

If I got this right I will create a pointer that points to the first SHIP (getNewEnemy) and the other one will not be printed out.

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Oct 17, 2014

This is my current code. The code is to remove the element in the list "head" that is "e". The code works if there is only one element in the list but if there are more than 1 element in the list, it doesn't work. The function should return true if there is an element that equals "e" and then it removes it and false if no element equals "e".

bool StringLinkedList::remove(const std::string& e){
StringNode* current = head;
int i = 0;
if (current == NULL)
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[Code] ....

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Here's the code for the addFirst() but i can't for the life of me figure out removeFirst()

        public void addFirst(int value)  {
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Jun 23, 2014

I am getting an error with my while loop(feels dumb) when running this code that I am allowed to modify. It is to remove all instances of an element within the list.

The loop is whithin this function:

void arrayListType<elemType>::removeAll(int location)

I have attached both the header file and main function file in .txt format.

void arrayListType<elemType>::removeAll(int location)*

Attached File(s) : 
header.txt (12.23K)
main function.txt (2.95K)

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Here is what in vector:

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Nov 18, 2013

I'm trying to sort my vector, find duplicate values using unique and erase them. Program can compile successfully but the duplicates are not removed.

output:

x: 3
y: 2
x: 6
y: 4
x: 3
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vector<Point2D> p2dvector;
void readData()

[Code].....

I also have operator== in my Point2D class which I understand it is required to use unique for vector.

bool operator==(const Point2D& lhs, const Point2D& rhs)
{
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I have a vector of

strings.vector input;

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sam
bob
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money
aardvark
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ex. bob corresponds to the its definition, which is sam.

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It doesn't matter if the sam and sammon don't match, all that matters is the first part of the pair.

The vector is already in alphabetical order. I can't use the algorithm library.

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//print first x,y,z element
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[Code] ...

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This is the code that does what I just described (I think)..

Code:
for(auto &elem : svec) {
istringstream strm(elem);
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//Magic
}

What would be the equivalent of using something else than an istringstream in this scenario and how does the istringstream work?

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Aug 16, 2014

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how I can do this?

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I'm having a problem filling a vector from a file. Basically, it is adding an empty element at the end. I'm new to Qt and haven't worked with file streams much so how to stop the stream before it adds the extra element.

void gui::get_data() {
mileage.clear();
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[Code] ....

But, if I add another element to the vector and write that the file look like this.

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0 0
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I have N vectors which look like this:

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Say i have elements :[123] [456] [789]

my combinations should be like
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148
149
157
158
159
167
168
169
247....

Also, I cant have any repetitions and only after all combinations of 1 are done only then the loop has to move to next combination ie 247 combination and so on.

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Code:

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[Code]...

I'm getting "field' is used like a 'type' error on jw.childcolor which causes other parts to error out.

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Here is some of my code;

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class Tile
{
private:
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[Code]....

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Code:
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