9.Vector_Erase

/*Sample Input
6
1 4 6 2 8 9
2
2 4
Sample Output
3
1 8 9
Explanation

The first query is to erase the 2nd element in the vector, which is 4. Then, modifed vector is {1 6 2 8 9}, 
we want to remove the range of 2~4, which means the 2nd and 3rd elements should be removed.
Then 6 and 2 in the modified vector are removed and we finally get {1 8 9}
*/
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
    int n,q;
    vector<int>arr;
    cin>>n;
    for(int i=0;i<n;i++)
    {
        int x;
        cin>>x;
        arr.push_back(x);
    }

    int a,b;
    cin>>q;
        cin>>a>>b;
        //cout<<arr[a][b]<<endl;
        arr.erase(arr.begin()+(q-1));
        arr.erase(arr.begin()+(a-1),arr.begin()+(b-1));
    
cout<<arr.size()<<endl;
for(size_t u=0;u<arr.size();u++)
{
    cout<<arr[u]<<" ";
}
    return 0;
}