#include <iostream>

int main()
{
  int N;
  std:: cin >> N;
  /* dynamic memory allocation */
  int ** p = new int * [N];
  for (int i = 0; i < N; i++)
    p[i] = new int [N];

  /* initialize upper triangle matrix */
  p[0][N-1] = 1;
  int m, n;
  int ct = 1, value = 2, iter = 1, row = 0, column = N - 2;
  while (ct <= N - 1)
  {
    n = column, m = row;
    for (int i = 0; i <= iter; i++)
    {
      p[m++][n++] = value;
      value++;
    }

    iter++; ct++;
    column--;
  }

  /* initialize the lower triangle matrix */
  row = 1; column = 0, iter = N - 2;
  while (ct > 1)
  {
    n = column, m = row;
    for (int i = 0; i <= iter; i++)
    {
      p[m++][n++] = value;
      value++;
    }

    iter--; ct--;
    row++;
  }

  /* display matrix */
  for (int i = 0; i < N; i++)
  {
    for (int j = 0; j < N; j++)
      std::cout << p[i][j] << " ";
    std::cout << std::endl;
  }

  /* release memory */
  for (int i = 0; i < N; i++)
    delete[] p[i];
  delete[] p;

  return 0;
}

We do not give a fuck. remove the code.

Agree