#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "bsd_rand.h"

#define N 512
#define T 32
#define C 0.5

char m[N][N];

static void rand_fill(char c, int n)
{
  while (n--) {
    int i, j;
    do {
      i = bsd_rand(N);
      j = bsd_rand(N);
    } while (m[i][j] != ' ');
    m[i][j] = c;
  }
}

static void init_array()
{
  memset(m, ' ', sizeof(m));
  rand_fill('r', N * N / 4);
  rand_fill('b', N * N / 4);
}

static void print_array()
{
  int i, j;
  char line[N + 1];

  for (j = 0; j < N; j++) {
    for (i = 0; i < N; i++) {
      line[i] = m[i][j];
    }
    line[N] = '\n';
    fwrite(line, N+1, 1, stdout);
  }
}

int main(int argc, char **argv)
{
  int n, cnt, show = 0;

  if (argc < 2) {
    fprintf(stderr, "need an argument\n");
    return 1;
  }
  if (argc > 2) {
    if (!strcmp(argv[2], "-show"))
      show = 1;
    else {
      fprintf(stderr, "unexpected argument: %s\n", argv[2]);
      return 1;
    }
  }
    
  n = atoi(argv[1]);
  bsd_srand(n);
  
  init_array();

  if (show) {
    printf("%d\n", N);
    print_array();
  }

  cnt = 42;

  if (!show)
    printf("%d\n", cnt);

  return 0;
}