#include <bits/stdc++.h>
using namespace std;
long long a, b, n, m, k, c[200200], d[200200], mx, mn;
long long ans;
string second, s1, s2;
const int N = (int)2e5 + 123, inf = 1e9, mod = 1e9 + 7;
const long long INF = 1e18;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  mn = inf;
  cin >> n >> k;
  for (int i = 1; i <= n; i++) {
    cin >> c[i];
    if (c[i] > mx) mx = c[i];
    if (c[i] < mn) mn = c[i];
  }
  if (mx - mn > k) {
    cout << "NO";
    return 0;
  } else {
    cout << "YES\n";
    for (int i = 1; i <= n; i++) {
      for (int j = 1; j <= mn; j++) {
        cout << 1 << " ";
      }
      for (int j = 1; j <= c[i] - mn; j++) {
        cout << j << " ";
      }
      cout << "\n";
    }
  }
  return 0;
}
