Created by
Mehdi Dana
| <?php
// http://www.bbc.co.uk/programmes/articles/5wkxjTtqRvq8Cyrrjxtk7tc/puzzle-for-today
$n = [1, 2, 3, 4, 5, 6, 7, 8, 9];
$s = ['', '+', '-'];
$co = [];
for ($i1 = 0; $i1 < 3; $i1++) {
for ($i2 = 0; $i2 < 3; $i2++) {
for ($i3 = 0; $i3 < 3; $i3++) {
for ($i4 = 0; $i4 < 3; $i4++) {
for ($i5 = 0; $i5 < 3; $i5++) {
for ($i6 = 0; $i6 < 3; $i6++) {
for ($i7 = 0; $i7 < 3; $i7++) {
for ($i8 = 0; $i8 < 3; $i8++) {
$co[] = [$s[$i1], $s[$i2], $s[$i3], $s[$i4], $s[$i5], $s[$i6], $s[$i7], $s[$i8]];
}
}
}
}
}
}
}
}
foreach ($co as $c) {
$t = $n[0] . $c[0] . $n[1] . $c[1] . $n[2] . $c[2] . $n[3] . $c[3] . $n[4] . $c[4] . $n[5] . $c[5] . $n[6] . $c[6] . $n[7] . $c[7] . $n[8];
$to = eval('return ' . $t . ';');
if ($to == 100) {
echo $t . '=' . $to . PHP_EOL;
}
}
|