Untitled

//1
#include<iostream>
#define ll long long
using namespace std;

int main()
{
    cin.tie(0),cout.tie(0)->sync_with_stdio(false);
    int n;
    cout << "Nhap so luong phan tu:" << endl;
    cin >> n;
    int a[n];
    for (int i = 0; i < n;i++)
    {
        cin >> a[i];
    }
    for (int i = 0; i < n - 1;i++)
    {

        cout << 1ll * a[i] * a[i + 1] << " ";
    }
    return 0;
}

//2
#include<iostream>

using namespace std;

int main()
{
    int n;
    cout << "Nhap so phan tu: " << endl;
    cin >> n;
    int a[n];
    for (int i = 0; i < n ; i++)
    {
        cout << "Nhap gia tri phan tu thu " << i + 1 << " ";
        cin >> a[i];
    }
    int maxSo = -1;
    for (int i = n - 1; i >= 0; i--)
    {
        if (a[i] > maxSo)
        {
            cout << a[i] << " ";
            maxSo = a[i];
        }
    }
}

//3
#include<iostream>

using namespace std;

void check(int a[], int n)
{
    int tongC = 0;
    int tongL = 0;
    int demC = 0;
    int demL = 0;
    for ( int i = 0; i < n; i++)
    {
        if (a[i] % 2 == 0)
        {
            demC++;
            tongC += a[i];
        }
        else 
        {
            demL++;
            tongL += a[i];
        }
    }
    cout << demC << endl;
    cout << demL << endl;
    cout << tongC << endl;
    cout << tongL << endl;
}
int main()
{
    cin.tie(0),cout.tie(0)->sync_with_stdio(false);
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++)
    {
        cin >> a[i];
    }
    check(a , n);
    return 0;
}

//4
#include<iostream>
#include<cmath>
using namespace std;

int mark[1000001];

int main()
{
    int n;
    cin >> n;
    int a[n];
    int max_val = -1000000000;
    for (int i = 0 ; i < n; i++)
    {
        cin >> a[i];
    }
    for (int i = 0; i < n ;i++)
    {
        mark[a[i]]++;
        if (a[i] > max_val)
        {
            max_val = a[i];
        }
    }
    for (int i = 0; i <= max_val; i++)
    {
        if (mark[i])
        {
            cout << i << " xuat hien " << mark[i] << " lan\n";
        }
    }
    return 0;
}

//5
#include<iostream>

using namespace std;

int main()
{
    int n;
    cin >> n;
    int a[n];
    for (int i = 0 ; i < n; i++)
    {
        cin >> a[i];
    }
    bool checkRong = true;
    for (int i = 0; i < n ; i++)
    {
        if ( a[i] != 79)
        {
            cout << a[i] << " ";
            checkRong = false;
        }
    }
    if (checkRong)
        cout << "EMPTY" << endl;
    return 0;
}