題意：給出字串，去除重複的字元，計算ascii的和，將其轉換成二進位制數顯示 

程式碼如下：

<?php

function readInt($file)
{
    while (false !== ($ch = fgetc($file))) {
        if (preg_match('/[[:digit:]]/', $ch)) break;
    }

    $sum = ord($ch) - ord('0');

    while (false !== ($ch = fgetc($file))) {
        if (!preg_match('/[[:digit:]]/', $ch)) break;
        $sum = $sum * 10 + (ord($ch) - ord('0'));
    }

    return $sum;
}

function readStr($file)
{
    while (false !== ($ch = fgetc($file))) {
        if (!preg_match('/[[:space:]]/', $ch)) break;
    }

    $sum = $ch;

    while (false !== ($ch = fgetc($file))) {
        if (preg_match('/[[:space:]]/', $ch)) break;
        $sum = $sum.$ch;
    }

    return $sum;
}

function numberToBinary($s)
{
    if ($s == 0 ) return '';
    else {
        return numberToBinary(floor($s / 2)).($s % 2);
    }
}

$debug = true;
$file = STDIN;
if ($debug) $file = fopen('./test.txt', 'r');

$t = readInt($file);
for ($i = 1; $i <= $t; $i++) {
    $s = readStr($file);
    $sum = 0;
    $set = array();
    for ($j = 0; $j < strlen($s); $j++) {
        if (!in_array($s[$j], $set)) {
            $sum += ord($s[$j]);
            $set[] = $s[$j];
        }
    }

    $ans = numberToBinary($sum);
    printf("#%d : %s\n", $i, $ans);

}
if ($debug) fclose($file);