Question

I’m new to C++ and I need some help creating this program:
I need to ask for the size of the list, then take the list containing integers and then ask the size of the second list and take those integers.

So far I have this:

#include <iostream>
using namespace std;
int main()

{
long int ARR[10];
int i,n;

printf("List 1 size: ");
scanf("%d",&n);

printf("List 1 data: ");
for(i=0;i<n;i++)
{
    scanf("%ld",&ARR[i]);

}

So that will take the input for the first list. Now I will repeat this for the second list.
But the key point is I now need to compare the two lists. If list1 is in list2 then I say yay, or if not then nay.

How do I go about comparing these two lists? And I am I on the right track with the input?

Thanks,

EmptyPeace

Answer 1

I think that’s what you expected.

#include <iostream>
#include <algorithm>
#include <vector>
#include <utility>

using namespace std;

bool mypredicate (int i, int j) {
  return (i==j);
}

int main(){
    int size_list = 0;
    vector<int> list1, list2;

    cin >> size_list;

    list1.resize(size_list);
    list2.resize(size_list);

    cout << list1.size() << endl;

    for (int i = 0; i < size_list; i++)
        cin >> list1[i];

    for (int i = 0; i < size_list; i++)
        cin >> list2[i];

    pair<vector<int>::iterator,vector<int>::iterator> mypair;
    mypair = mismatch (list1.begin(), list1.end(), list2.begin(), mypredicate);


    if( mypair.first == list1.end() && mypair.second == list2.end() )
        cout << "are equals" << endl;
    else{
        cout << "aren't " << endl;
        cout << *mypair.first << ", " << *mypair.second << endl;
    }

    system("pause");
    return 0;
}