#include <bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:64000000")
const int maxn = 310;
const int inf = 1000000007;
const int mod = 1000000007;
const long double eps = 1e-8;
int n;
int y[maxn][maxn];
long double res[maxn];
int main() {
  cout.precision(10);
  cout << fixed;
  int n, k;
  while (cin >> n >> k) {
    for (int i = 0; i < n; i++) {
      res[i] = 0;
      for (int j = 0; j <= k; j++) {
        cin >> y[i][j];
      }
    }
    vector<pair<long double, long double> > v;
    v.push_back(make_pair(0, 0));
    v.push_back(make_pair(k, 0));
    for (int i = 0; i < n; i++) {
      vector<pair<long double, long double> > g;
      vector<pair<long double, long double> > nv;
      for (int l = 0; l <= k; l++) g.push_back(make_pair(l, y[i][l]));
      int cv = 0, cg = 0;
      long double cx = 0;
      while (1) {
        if (fabs(cx - k) < eps) {
          nv.push_back(make_pair(k, max(v[cv].second, g[cg].second)));
          break;
        }
        long double nx = min(v[cv + 1].first, g[cg + 1].first);
        long double y1v = v[cv].second + (cx - v[cv].first) *
                                             (v[cv + 1].second - v[cv].second) /
                                             (v[cv + 1].first - v[cv].first);
        long double y2v = v[cv].second + (nx - v[cv].first) *
                                             (v[cv + 1].second - v[cv].second) /
                                             (v[cv + 1].first - v[cv].first);
        long double y1g = g[cg].second + (cx - g[cg].first) *
                                             (g[cg + 1].second - g[cg].second) /
                                             (g[cg + 1].first - g[cg].first);
        long double y2g = g[cg].second + (nx - g[cg].first) *
                                             (g[cg + 1].second - g[cg].second) /
                                             (g[cg + 1].first - g[cg].first);
        if (y1v > y1g + eps && y2v < y2g - eps) {
          long double x;
          x = (y1g - y1v) / ((y2v - y1v) - (y2g - y1g));
          long double y = y1v + x * (y2v - y1v);
          x = cx + x * (nx - cx);
          nv.push_back(make_pair(cx, y1v));
          nv.push_back(make_pair(x, y));
          res[i] += (y + y2g) * (nx - x) / 2.0;
          res[i] -= (y + y2v) * (nx - x) / 2.0;
        } else if (y1v < y1g - eps && y2v > y2g + eps) {
          long double x;
          x = (y1g - y1v) / ((y2v - y1v) - (y2g - y1g));
          long double y = y1v + x * (y2v - y1v);
          x = cx + x * (nx - cx);
          nv.push_back(make_pair(cx, y1g));
          nv.push_back(make_pair(x, y));
          res[i] += (y + y1g) * (x - cx) / 2.0;
          res[i] -= (y + y1v) * (x - cx) / 2.0;
        } else if (y1v > y1g - eps && y2v > y2g - eps) {
          nv.push_back(make_pair(cx, y1v));
        } else if (y1v < y1g + eps && y2v < y2g + eps) {
          nv.push_back(make_pair(cx, y1g));
          res[i] += (y1g + y2g) * (nx - cx) / 2.0;
          res[i] -= (y1v + y2v) * (nx - cx) / 2.0;
        } else
          assert(0);
        if (fabs(nx - v[cv + 1].first) < eps) cv++;
        if (fabs(nx - g[cg + 1].first) < eps) cg++;
        cx = nx;
      }
      v = nv;
      nv.clear();
      nv.push_back(v[0]);
      for (int i = 1; i < v.size(); i++) {
        if (v[i].first - v[i - 1].first > eps) nv.push_back(v[i]);
      }
      v = nv;
    }
    for (int i = 0; i < n; i++) cout << res[i] << endl;
  }
  return 0;
}
