io-developer

function sum(input) {
    var sum = 0;
    for (var i = 0, l = input.length; i < l; i++) {
        if (input.charAt(i) == input.charAt((i + 1) % l)) {
            sum += parseInt(input.charAt(i));
        }
    }
    return sum;
}

io-developer

function sum(input) {
    var sum = 0;
    for (var i = 0, l = input.length; i < l; i++) {
        if (input.charAt(i) == input.charAt((i + (l / 2)) % l)) {
            sum += parseInt(input.charAt(i));
        }
    }
    return sum;
}

io-developer

function calcAt(row, col, generator) {
    var val;
    for (var i = 0, l = 2 * Math.max(row, col); i <= l; i++) {
        for (var j = 0; j <= i; j++) {
            val = generator(val);
            if (row == i - j && col == j) {
                return val;
            }
        }
    }

io-developer

function findSetsIn(list, noEmptySet) {
    var result = noEmptySet ? [] : [[]];
    for (var i = 0; i < list.length; i++) {
        var base = [ list[i] ];
        result.push(base);
        var tail = findSetsIn(list.slice(i + 1), true);
        for (var j = 0; j < tail.length; j++) {
            result.push(base.concat(tail[j]));
        }
    }

io-developer

function setsOf(list) {
    var l = list.length;
    var sets = [];
    var total = 1 << l;
    for (var i = 0; i < total; i++) {
        var sub = [];
        for (var j = 0; j < l; j++) {
            if (i & (1 << j)) {
                sub.push(list[j]);
            }

io-developer

<?php

function sets_of($list) {
    $sets = [];
    $total = 1 << count($list);
    for ($i = 0; $i < $total; $i++) {
        $sub = [];
        foreach ($list as $j => $val) {
            if ($i & (1 << $j)) {
                $sub[] = $val;

io-developer

<?php

function generate_sets($values) {
    $total = 1 << count($values);
    for ($i = 0; $i < $total; $i++) {
        $subset = [];
        foreach ($values as $j => $val) {
            if ($i & (1 << $j)) {
                $subset[] = $val;
            }

io-developer

function calc(input) {
    var checksum = 0;
    input.split('\n').forEach(row => {
        var nums = row.split('\t').map(n => parseInt(n));
        var min = nums.reduce((a, b) => Math.min(a, b));
        var max = nums.reduce((a, b) => Math.max(a, b));
        checksum += max - min;
    });
    return checksum;
}

io-developer

function calc(input) {
    var checksum = 0;
    input.split('\n').forEach(row => {
        var nums = row.split('\t').map(n => parseInt(n));
        checksum += findIntDivs(nums).reduce((a, b) => a + b, 0);
    });
    return checksum;
}

function findIntDivs(nums) {

io-developer

function calc(inputNum) {
    var coord = spiralCoord(inputNum - 1);
    return Math.abs(coord.x) + Math.abs(coord.y);
}

function spiralCoord(index) {
    var coord = { x: 0, y: -1 };
    var dir = 3;
    var vecs = {
        0: { x: 1, y: 0 },