Prefix Sums

#include <iostream>
#include <vector>
using namespace std;
long long n, k,temp,i,current;
int main()
{
    cin >> n >> k;
    vector <long long> array;
    for (i = 0; i < n; ++i)
    {
        cin >> temp;
        array.push_back(temp);
    }
    i = 0;
    current = n - 1;
    while (true)
    {
        if (array[current] >= k)
        {
            cout << i;
            break;
        }
        if (i == 0)
        {
            long long sum = 0;
            for (long long j = 0; j < n; ++j)
                sum += array[j];
            array.push_back(sum);
        }
        else
        {
            temp = array[current] * 2;
            array.push_back(temp);
        }
        ++current;
        ++i;
    }
    return 0;
}