Lakshanz · August 21, 2019 10:12
diff --git a/even_digits.php b/even_digits.php
 <?php

 function getFirstOddNumPosition($num)
 {
    $digits = str_split($num);
    $i = 0;

    foreach ($digits as $digit) {
        if ($digit % 2 != 0) {
            return $i;
        }

        $i++;
    }

    return -1;
 }

 function getPlusCount($num, $digits, $first_odd_position)
 {
    foreach ($digits as $index => $digit) {
        if ($index == $first_odd_position) {
            $digits[$index] = $digit + 1;
        } elseif ($index > $first_odd_position) {
            $digits[$index] = 0;
        }
    }

    return intval(join("", $digits)) - $num;
 }

 function getMinusCount($num, $digits, $first_odd_position)
 {
    foreach ($digits as $index => $digit) {
        if ($index == $first_odd_position) {
            $digits[$index] = $digit - 1;
        } elseif ($index > $first_odd_position) {
            $digits[$index] = 8;
        }
    }

    return $num - intval(join("", $digits));
 }

 function getCount($num)
 {
    $first_odd_position = getFirstOddNumPosition($num);

    // No odds found
    if ($first_odd_position === -1) {
        return 0;
    }

    // Odd is at last position
    if (($first_odd_position + 1) == strlen($num)) {
        return 1;
    }

    $digits = str_split($num);

    // If first odd digit is 9, lets skip to minus button
    if ($digits[$first_odd_position] == 9) {
        return getMinusCount($num, $digits, $first_odd_position);
    }

    $plus_count = getPlusCount($num, $digits, $first_odd_position);
    $minus_count = getMinusCount($num, $digits, $first_odd_position);

    if ($plus_count < $minus_count) {
        return $plus_count;
    }

    return $minus_count;
 }

 $f = fopen('php://stdin', 'r');
 $i = 0;
 $test_cases = 0;

 while ($line = fgets($f)) {
    $line = ltrim($line);

    if ($i == 0) {
        $test_cases = intval($line);
        $i++;
        continue;
    }

    $count = getCount(intval($line));
    print "Case #$i: $count";

    if ($i != $cases) {
        print "\n";
    }
    $i++;
 }

 fclose($f);
 exit;
diff --git a/Problem.md b/Problem.md
	<?php

	function getFirstOddNumPosition($num)
	{
	$digits = str_split($num);
	$i = 0;

	foreach ($digits as $digit) {
	if ($digit % 2 != 0) {
	return $i;
	}

	$i++;
	}

	return -1;
	}

	function getPlusCount($num, $digits, $first_odd_position)
	{
	foreach ($digits as $index => $digit) {
	if ($index == $first_odd_position) {
	$digits[$index] = $digit + 1;
	} elseif ($index > $first_odd_position) {
	$digits[$index] = 0;
	}
	}

	return intval(join("", $digits)) - $num;
	}

	function getMinusCount($num, $digits, $first_odd_position)
	{
	foreach ($digits as $index => $digit) {
	if ($index == $first_odd_position) {
	$digits[$index] = $digit - 1;
	} elseif ($index > $first_odd_position) {
	$digits[$index] = 8;
	}
	}

	return $num - intval(join("", $digits));
	}

	function getCount($num)
	{
	$first_odd_position = getFirstOddNumPosition($num);

	// No odds found
	if ($first_odd_position === -1) {
	return 0;
	}

	// Odd is at last position
	if (($first_odd_position + 1) == strlen($num)) {
	return 1;
	}

	$digits = str_split($num);

	// If first odd digit is 9, lets skip to minus button
	if ($digits[$first_odd_position] == 9) {
	return getMinusCount($num, $digits, $first_odd_position);
	}

	$plus_count = getPlusCount($num, $digits, $first_odd_position);
	$minus_count = getMinusCount($num, $digits, $first_odd_position);

	if ($plus_count < $minus_count) {
	return $plus_count;
	}

	return $minus_count;
	}

	$f = fopen('php://stdin', 'r');
	$i = 0;
	$test_cases = 0;

	while ($line = fgets($f)) {
	$line = ltrim($line);

	if ($i == 0) {
	$test_cases = intval($line);
	$i++;
	continue;
	}

	$count = getCount(intval($line));
	print "Case #$i: $count";

	if ($i != $cases) {
	print "\n";
	}
	$i++;
	}

	fclose($f);
	exit;