C++ :: Counting Of Elements In A List Of Lists
May 1, 2013
I have a problem like this: I do not know how to count the number of elements in a list of lists. I have the following list of list.
#define VAR(V, init) __typeof(init) V=(init)
#define FOR_EACH(I,C) for(VAR(I, (C).begin()), ite = (C).end();
(I) != ite;
++(I))
std::vector<std::vector<GLdouble> > contours;
[Code] ....
I do not know how to write the part indicated in Bold that represents the number of elements of contour. As seen from the code used for the tesselation OpenGL.
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Apr 29, 2013
I'm trying to write a function that takes two linked lists and creates a third one with only the common elements.
It assumes the first list (the caller) has no dups, but it doesn't seem to be working. The program doesn't crash, it just hangs when it is supposed to display L3 (the third list)..everything else runs and is displayed fine.
template <typename T>
LList <T> LList <T>:: common (LList <T> &B)//common fct
{
Node <T> *hunter1 = Head;
[Code]......
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Nov 21, 2013
Write a program in C/C++ that counts and summing the elements (numbers) from the given interval in the array.
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Jan 6, 2015
I am reading a book currently on data structures in c++. The questions I have is how I would be able to swap two adjacent elements by adjusting only the links (not the data) using, a) singly linked lists, doubly linked lists.
For the single linked list which I am somewhat familiar with (by the content of the book), I would consider taking the Node A, and copying its data into a new Node temp, then re-routing the pointer from whatever connected to Node A, now to Node temp. now I want to re-route the pointer of Node B to Node temp and Node temp to whatever Node was being connected from Node B. Is this the correct approach?
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Aug 21, 2014
This is going to seem like a stupid question but how can I count the elements of a const array. Surely c++ compilers provide a count for const arrays?
const wchar_t* ItemHandler::itemNames[] = {L"Coins", L"Matches"};
const wchar_t* ItemHandler::itemIconLocations[] = {L"./media/Items/coins.png" , L"./media/Items/matches.png"};
const bool ItemHandler::itemStackable[] = {1, 1};
I want to count the elements so if the server sends a bad item id it won't crash every client in range lol. I heard that the sizeof keyword returns the size of the array in bytes. I used to think the size of keyword would return the element count but found out it isn't.
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Mar 20, 2013
I have a dynamic number of lists coming in from a different method . i need to find out the common elements present in all of the lists .
How do i do it with intersect construct in C#.
Placing it in a loop gets me the elements common in the last comparison , but never gets me elements commong in all lists.
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Jul 19, 2013
I have read that the Erase-remove idiom is the way to go. I have a rough understanding of how this works but am unsure whether I can implement a match-counter along with it.
For counting alone, I would use something like this:
Code:
std::vector<std::string> v; // contains duplicate strings in different elements
std::string term = "foo"; // search term, changing at runtime as well
unsigned int matches = 0;
for( auto e : v ) {
if( e == term ) {
[Code] .....
I'm not sure how (or if) I can combine the two things. That is, I don't know how to integrate a function comparing two (changing) strings into the remove_if() method. Nor do I know how to increment a counter during iteration.
The vector is extremely large, so speed is paramount. I think there are many other avenues for optimization, but decreasing the vector's size for each consecutive search could deliver a big speed boost for subsequent searches I imagine, as traversing it holds the biggest cost.
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Oct 3, 2013
I was writing generic class Array (based on counting access to elements)and i got compiling error I cannot even understand (in vs2012).
Code: [URL] ....
Error: [URL] ....
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Aug 20, 2014
I would like to have a List with Lists. (every list with have strings ints and i would like to be able to have all the lists in a array) is this approach too expensive and i will have problem with the memory or something? is it better if i have a list with the names of the lists and access them that way?
In order to give a better understanding of what i need this is what im trying to do but throws errors:
public List<MusicItem> Theme1 { get; set; }
public List<List<MusicItem>> AllThemes { get; set; }
AllThemes = new List<List<MusicItem>> {
Theme1 = new List<MusicItem> {
[Code] .....
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Jan 23, 2015
Im trying to do something like this:
private List<Calm> calm = null;
private List<Horror> horror = null;
private List<Battle> battle = null;
[Code].....
I want with lists[0][0].Name to get the Name variable from the first item of the list calm, but this doesnt working, is there any other way to do it?
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Feb 14, 2013
I've been given a ton of code (5 files worth) that does various things with a linked list. I'm supposed to add a function to split this list into two separate lists by testing whether or not each number is <,=, or > a certain element. I am completely lost and don't understand linked lists at all. I'm also a bit lost on pointers since it's been almost a year since I've looked at programming, but I could probably figure that out if I could just get this linked list thing down.
Here's my SplitLists function so far:
void UnsortedType::SplitLists () {
// Pointers for each new list
NodeType* list1Ptr;
NodeType* list2Ptr;
[Code] ....
In other places in the code, I have GetNextItem, ComparedTo, PutItem, and ResetList that were already given to me.
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May 18, 2014
Main
#include <iostream>
#include "item.h"
#include "inventory.h"
#include <stdlib.h>
#include <string.h>
#pragma GCC diagnostic ignored "-Wwrite-strings"
[code]....
what I would want to happen is is have my item increment in size/count instead of a new object. How would you handle this algorithmically.
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Oct 9, 2014
can we pass two linked lists as argument in a member function to add two linked lists? and how to access them both in the function??
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Oct 18, 2013
I've been looking through containers in the reference section and I can't figure out how to access (i.e. READ) elements in a list...
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May 11, 2014
How can i look into the element that are pushed into the list. Something like listPointer[0].heapPointer,50
class CA{
public:
CA(void);
[Code].....
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Jul 24, 2014
I am given an array with n elements but need to write a function where it returns n-1 elements. Do I need a loop for this? Or must I write a prototype...
Here is what I have thus far:
//given array with 5 elements function must return value 4 elements since -1 is a special character length of list is finite
#include <iostream>
using namespace std;
int main () {
int array [] = {1, 4, -1, 3, 2};
cout << "The array has " <<sizeof (array)/ sizeof (int)<< " elements"<< endl;
return 0;
}
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Aug 31, 2013
#include<stdio.h>
#include<iostream.h>
struct node {
int info;
struct node *next;
[Code] ....
I am getting runtime error in some cases. Sometimes the last input is printed. How to correct the code and display all elements in the linked list.
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Aug 15, 2014
Code:
#include<stdio.h>
#include<stdlib.h>
struct node{
int data;
struct node *next;
[Code] .....
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Apr 22, 2013
Why isn't this bubble sort working?
void LList :: bubbleSort (LList A, int n){
Node *temp;
temp = Head;
int hold;
for (int pass = 1; pass <= n-1; pass++) // number of passes needed for bubblesort is the number of elements-1 {
for (int c = 0; c < n-pass; c++)//only runs for unsorted elements
[Code] ....
It is passed the LList, and the number of items in the list...
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Aug 27, 2014
I am trying to query an Informix database using a List<T> collection's elements as variables. I can build the list and connect to the database, but I am unsure how to iterate through the list and query the database for each item in the collection.
My list is of type string, and contains Order Numbers. I want to query item information for each order number in the list.
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Jun 9, 2013
I'm doing a homework aasignment on templates, and i have to build a list. The problem starts when i am trying to add elements to the list. For instance if i chose to add 5 different elements (1,2,3,4,5) the output will be (5,5,5,5,5).
Code:
void add_back(T t){
Node* tmp = new Node;
tmp -> m_data = &t;
if(m_head == NULL) {
[Code] ....
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Sep 13, 2014
I need to make singly and doubly linked list classes that can insert elements. Once the lists are created, I need to order the linked list elements according to a certain pattern.
order2 pattern:
input: 0 1 2 3 4 5 6 7
output: 1 0 3 2 5 4 7 6
order3 pattern:
input: 0 1 2 3 4 5 6 7 8 9 10 11
output: 2 1 0 5 4 3 8 7 6 11 10 9
sequence order pattern:
input: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
output: 1 0 4 3 2 8 7 6 5 13 12 11 10 9
reverse pattern:
input: 0 1 2 3 4 5 6 7 8 9
output: 9 8 7 6 5 4 3 2 1 0
My instructor has given the description of the required classes in a file interfaces01.h as:
#pragma once
#include <cstdlib>
struct ISingleNode {
ISingleNode() {}
virtual ~ISingleNode() {}
virtual void setValue(int value) = 0;
virtual int getValue() = 0;
[Code] ....
However when I am compiling these files in vs 2013 I am getting the error: cannot open include file Singlenode.h,Singlelist.h.
Also I am not too sure about the sorting and reverse logic. How can I implement these logics.
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Mar 19, 2014
I create a list of vectors (a vector of n vectors of m elements).
std::vector <std::vector <int> > vsFA (n, std::vector<int>(n));
How I assign values? I try below, but not worked
void armazenaFA( std::vector <int> &vFA) // this function only knows about vFA
{ vsFA[n] [m]= simTime().dbl();
OR
vsFA[n].push_back(simTime().dbl());
}
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Nov 7, 2013
I got a permutation question, I got two different std::list:
list<string> slist;
slist.push_back("str111");
slist.push_back("str222");
slist.push_back("str333");
list<int> ilist;
ilist.push_back(100);
ilist.push_back(200);
I need the permutation for both two lists, the result should be like this:
#include <iostream>
#include <string>
#include <list>
#include <algorithm>
using namespace std;
template <typename value_t>
void dump_list(const list<value_t>& lst) {
[Code] ....
See, there are two do while loop, if I need a permutation with more than two lists, there'll be more and more do-while loops, that's make code looks ugly, I wonder if stl has some tricky way that can do this with just one next_permutation.
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Dec 27, 2013
I'm trying to set up a simple implementation of a double linked list. I can't make it fly.
Code:
#include <iostream>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
using namespace std;
[Code] ...
I seem to create a root vertex, but I can't establish if I connect sub nodes to my list.
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Mar 6, 2015
I am merging two linked list but the output of the program is not printing insert
Code:
typedef struct Merge
{
int info;
[Code].....
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