We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
  1. All Contests
  2. ProjectEuler+
  3. Project Euler #67: Maximum path sum II
  4. Discussions

Project Euler #67: Maximum path sum II

Contest ends in

  • willianmonts
     + 0 comments

    In PHP

    Since I'll be using a bottom-up approach, I've assembled the triangle in reverse before calling the solution function

    <?php

function solution($triangle) {
    $len = count($triangle);
    foreach ($triangle as $i => &$curr) {
        if ($i == $len - 1) {
            return $curr[0];
        }
        
        $next = &$triangle[$i + 1];
        foreach ($next as $j => $val) {
            $next[$j] += max($curr[$j], $curr[$j + 1]);
        }
    }
}

$_fp = fopen("php://stdin", "r");
$q = intval(trim(fgets($_fp)));

while ($q--) {
    $j = intval(trim(fgets($_fp)));
    $triangle = array_fill(0, $j, null);
    while ($j--) {
        $triangle[$j] = array_map('intval', explode(' ', trim(fgets($_fp))));
    }
    echo solution($triangle), PHP_EOL;
}

fclose($_fp);