var a = [
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
];
for (var i = 0; i < 5; i++)
{
  for (var j = 0; j <=i; j++)
  {
    a[i][j] = 1;
  }
}
document.body.innerHTML = '';
document.write("1st<br />");
for (var i = 0; i < 5; i++)
{
  for (var j = 0; j < 5; j++)
  {
    document.write(a[i][j]);
  }
  document.write("<br />");
}
 var a = [
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
];
for (var i = 0; i < 5; i++)
{
  for (var j = 5,counter=0; counter <=i;counter++)
  {
    a[i][j-(counter+1)] = 1;
  }
}
document.write("2nd<br />");
for (var i = 0; i < 5; i++)
{
  for (var j = 0; j < 5; j++)
  {
    document.write(a[i][j]);
  }
  document.write("<br />");
}
var a = [
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
];
for (var i = 0; i < 5; i++)
{
  for (var j = 4; j>=i;j--)
  {
    a[i][j] = 1;
  }
}
document.write("3rd<br />");
for (var i = 0; i < 5; i++)
{
  for (var j = 0; j < 5; j++)
  {
    document.write(a[i][j]);
  }
  document.write("<br />");
}
var a = [
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
  [0,0,0,0,0],
];
for (var i = 0; i < 5; i++)
{
  for (var j = 0; 4-i>=j;j++)
  {
    a[i][j] = 1;
  }
}
document.write("4th<br />");
for (var i = 0; i < 5; i++)
{
  for (var j = 0; j<5; j++)
  {
    document.write(a[i][j]);
  }
  document.write("<br />");
}