Comments for My Thought Exactly

Comment on Project Euler Problem 4 (PHP) by Joseph

Joseph — Thu, 15 Dec 2011 16:51:16 +0000

I haven’t had a chance to run through the code just yet, but it runs beautifully as well as much more efficiently than mine. Thank you!

Comment on Project Euler Problem 4 (PHP) by Kah Thong

Kah Thong — Tue, 13 Dec 2011 16:15:56 +0000

Hi thanks for your solution, however it tends to slow down on very large numbers (4 digits above)

Here’s my not-so-clean solution, but I THINK it works.

$start = microtime(TRUE);


$palindrome = $palindrome_i = $palindome_j = 0;

for ($i = 999; $i > 99; $i--) {

  for ($j = 999; $j > 99; $j--) {

    $product = $i * $j;

    if ($product == strrev($product)) {

      $palindrome_j = $j;

      $palindrome = $product;

      break;

    }

  }

  if ($palindrome) {

    $palindrome_i = $i;

    break;

  }

}

$palindrome2 = 0;

for ($i = $palindrome_i; $i > $palindrome_j; $i--) {

  for ($j = $palindrome_i; $j > $palindrome_j; $j--) {

    $product = $i * $j;

    if ($product == strrev($product)) {

      $palindrome2 = $product;

      break;

    }

  }

  if ($palindrome2) {

    break;

  }

}

echo ($palindrome2) ? $palindrome2 : $palindrome;

$end = microtime(TRUE); echo '' . number_format($end - $start, 4) . ' seconds';

Just sharing here, I could be wrong.

Comment on Project Euler Problem 3 (PHP) by Joseph

Joseph — Tue, 13 Dec 2011 14:31:39 +0000

You are correct. Somehow I copied the wrong one in. It has been fixed now and shows the correct solution. Thanks for pointing it out.

Comment on Project Euler Problem 3 (PHP) by Kah Thong

Kah Thong — Tue, 13 Dec 2011 13:39:19 +0000

I believe you have the wrong solution here?
This solution is for problem #2.

Comment on Legal and Moral Ramifications of Marriage Laws by Joseph

Joseph — Fri, 08 Jul 2011 14:09:37 +0000

As a point of note, propositions in Texas are very different from those in California. In Texas, propositions are things that the legislature is considering bringing to the floor, but they want a gauge of pulic support first. In California, they are put into law immediately.