#include <bits/stdc++.h>
//#include <iterator>
using namespace std;

typedef long long ll;
typedef long double ld;

const int N = 1e5 + 7;
const ll MOD = 1e9 + 7;

struct point
{
    ld x;
    ld y;
    int i;
};

int n;
ld rr, xx;
point a[1007];
vector <point> v;
bool g = false;

bool check(ld x, ld y)
{
    if (g) cout << "    " << fixed << setprecision(10) << x << ' ' << y << endl;
    for (int i = 0; i < (int) v.size(); i++)
    {
        ld x1 = v[i].x;
        ld y1 = v[i].y;
        ld dst = sqrt((x - x1) * (x - x1) + (y - y1) * (y - y1));
        if (g) cout << "x1 y1\n";
        if (g) cout << fixed << setprecision(3) << x1 << ' ' << y1 << endl;
        if (g) cout << fixed << setprecision(10) << dst << endl;
        if (dst <= 2 * rr)
            return false;
    }
    return true;
}
int main()
{
    ios::sync_with_stdio(0);
    cin >> n >> rr;
    for (int i = 0; i < n; i++)
    {
        point f;
        cin >> xx;
        f.x = xx;
        f.y = 0;
        f.i = i;
        a[i] = f;
    }
    v.push_back(a[0]);
    v[0].y = rr;
    ld l, r, m;
    cout << fixed << setprecision(10) << rr << ' ';
    for (int i = 1; i < n; i++)
    {
        l = rr;
        r = (ld) 1e18;
        for (int j = 0; j <= 500; j++)
        {
            m = (l + r) / 2;
            if (a[i].x == 12 && m <= 100.0)
                g = true;
            if (check(a[i].x, m))
                r = m;
            else
                l = m;
        }
        a[i].y = r;
        v.push_back(a[i]);
        cout << fixed << setprecision(10) << r << endl;
    }
    return 0;
}