#include <bits/stdc++.h>
using namespace std;
vector<pair<double, double> > a;
pair<double, double> cur;
double r;
void findmax(pair<double, double> p) {
  double y =
      sqrt(2 * r * 2 * r - abs(p.first - cur.first) * abs(p.first - cur.first));
  y += p.second;
  cur.second = max(cur.second, y);
}
void doit(double x) {
  for (double k = 0; k < a.size(); k++) {
    if (abs(x - a[k].first) <= 2 * r) findmax(a[k]);
  }
  a.push_back(cur);
}
int main() {
  double x, n;
  cin >> n >> r;
  for (double k = 0; k < n; k++) {
    cin >> x;
    cur.first = x;
    cur.second = r;
    doit(x);
  }
  for (double k = 0; k < a.size(); k++)
    cout << setprecision(17) << a[k].second << " ";
  return 0;
}
