task 1

#include <iostream>
#include <ctime>
#include <stdlib.h>
using namespace std;

int main()
{
    int n;//number of numbers
    cin>>n;
    int arr[100];
    srand(time(0));
    for (int i=0; i<n; i++)
    {
        arr[i]=rand()%30-10;
        cout<<i+1<<'.'<<arr[i]<<endl;
    }
    bool flag=false;
    for (int i=0; i<n-1; i++)
        {
            if (arr[i]*arr[i+1]>0)
                {
                    flag=true;
                    break;
                }
        }

    if (flag==true) cout<<"yes";
    else cout<<"no";
}