Arrays

#include <iostream>
using namespace std;

int main() {
    int x;
    int N[1000];
    cin>>x;
    int i;
    for (i = 1; i <= x; i++)
    {
        cin>>N[i];
    }
    for (int a = 1; a <= x; x+= 2)
    {
    N[i] = N[a]-1;
    }
    for (int b = 0; b <= x; b+= 2)
    {
    N[i] = N[b]*2;
    }

    for (int c = 1; c <= x; c++)
    {
        cout<<N[c];
    }
    return 0;
}