Question

How to get the total numbers with no repeated digits from a range of numbers in PHP

Answer 1

function repeated_yes_0_no_1($n) {
    $arr = array_fill(0, 10, 0);
    
    while($n > 0) {
        $digit = $n % 10;

        if ($arr[$digit] > 0) { // repeated = yes
            return 0;
        }
        
        $arr[$digit]++;
        
        $n = (int)($n / 10);
    }

    return 1;
}

function GetTotalNumbersWithNoRepeatedDigits($start, $end) {
    $total = 0;
    
    for ($i = $start; $i <= $end; $i++) {
        $total += repeated_yes_0_no_1($i);
    }
    
    return $total;
}
        
$start = 1;
$end = 100;

echo GetTotalNumbersWithNoRepeatedDigits($start, $end);




/*
run:

90

*/

 

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