Maze generation and unicode characters - c++

Question

I am new to c++ and need help making my maze look better. I want to use unicode characters but my program crashes. Here is a picture of my random maze. image of my maze
You can check my code here
#include <iostream>
#include <ctime>
#include <cstring>
using std::cout;
using std::fill;
using std::endl;
using std::cin;
using std::cout;
int main()
{
srand(time(NULL));
int arr_x[1000] = { 0 }; fill(arr_x + 0, arr_x + 1000, -1);
int arr_y[1000] = { 0 }; fill(arr_y + 0, arr_y + 1000, -1);
//coordinates used to go back when the generation runs into blocked path
char arr[100][100]; memset(arr, '#', sizeof(char) * 100 * 100);
//creating 100x100 char array of #
int rows, cols = 0;
cout << "Rows "; cin >> rows;//choose
cout << "Columns"; cin >> cols;
int random_number = 0; int x = 0; int y = 0; int index = 0;
arr[0][0] = ' ';
while (1)
{
random_number = rand() % (4) + 1;
int available_paths = 0;
if (x + 1 >= 0 && x + 1 < rows && arr[x + 1][y] != ' ' && arr[x + 2][y] != ' ' && arr[x + 1][y + 1] != ' ' && arr[x + 1][y - 1] != ' ') { available_paths++; if (random_number == 1) { x = x + 1; arr_x[index] = x; arr_y[index] = y; arr[x][y] = ' '; index++; } }
if (x - 1 >= 0 && x - 1 < rows && arr[x - 1][y] != ' ' && arr[x - 2][y] != ' ' && arr[x - 1][y + 1] != ' ' && arr[x - 1][y - 1] != ' ') { available_paths++; if (random_number == 2) { x = x - 1; arr_x[index] = x; arr_y[index] = y; arr[x][y] = ' '; index++; } }
if (y + 1 >= 0 && y + 1 < cols && arr[x][y + 1] != ' ' && arr[x][y + 2] != ' ' && arr[x + 1][y + 1] != ' ' && arr[x - 1][y + 1] != ' ') { available_paths++; if (random_number == 3) { y = y + 1; arr_x[index] = x; arr_y[index] = y; arr[x][y] = ' '; index++; } }
if (y - 1 >= 0 && y - 1 < cols && arr[x][y - 1] != ' ' && arr[x][y - 2] != ' ' && arr[x + 1][y - 1] != ' ' && arr[x - 1][y - 1] != ' ') { available_paths++; if (random_number == 4) { y = y - 1; arr_x[index] = x; arr_y[index] = y; arr[x][y] = ' '; index++; } }
if (available_paths == 0) //if available_paths are 0 I need to go
{ //back to the last visited square
index = index - 1;
if (index < 0) { break; }
x = arr_x[index]; y = arr_y[index];
}
}
for (int x = 0; x < rows; x++)
{
for (int y = 0; y < cols; y++)
{
cout << "[" << arr[x][y] << "]";
if (y == (cols - 1)) { cout << endl; }
}
}
int end;
cin >> end;
}
I am thinking about using this character - ▮. Is there any simple way to improve my algorithm?