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PHP and Javascript solutions to freshly added easy challenge #123 - Efficient Delivery (still a little buggy on oil-to-be-added calculation)
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‎hard/123 - Efficient Delivery/123.js‎

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// https://www.codeeval.com/open_challenges/123/
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var solutions = null;
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var min_diff = 0;
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function efficient_delivery( tankers, idx, oil, allocation){
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if( oil > 0 ){
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var capacity = tankers[idx];
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var nb = tankers.length;
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var last_tanker = false;
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if( capacity ){
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var cnt = Math.floor(oil / capacity);
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var rest = oil%capacity;
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if( idx == (nb-1) ){
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last_tanker = true;
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if( rest === 0 ){
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allocation[idx] = cnt;
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oil = 0;
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}
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else{
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oil -= cnt * capacity;
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}
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}
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else{
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for(var i = 0; i <= cnt ; i++ ){
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var new_allocation = [];
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for( var a in allocation){
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new_allocation[a] = allocation[a];
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}
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new_allocation[idx] = i;
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efficient_delivery(tankers, idx + 1, oil - i * capacity, new_allocation);
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}
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}
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}
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if( last_tanker && oil>0 ){
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// no more tankers available
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// amount of oil left < amount possible on a tanker
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var diff = Number.POSITIVE_INFINITY;
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for( var t in tankers ){
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if( oil < tankers[t] ){
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diff = tankers[t] - oil;
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}
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}
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if( diff < min_diff ){
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min_diff = diff;
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}
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// console.log(min_diff);
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}
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}
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if( oil === 0 ){
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// oil = 0
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// ok
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allocation.reverse();
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solutions.push( allocation.join(',') );
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}
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}
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function solution_cmp(a,b){
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a = a.split(',');
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b = b.split(',');
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var aa = '';
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var bb = '';
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for(var i=0, cnt=a.length ; i < cnt ; i++){
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aa += new Array(5 - a[i].length).join('0') + a[i];
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bb += new Array(5 - b[i].length).join('0') + b[i];
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}
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return aa > bb ? 1 : -1;
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}
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var fs = require("fs");
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fs.readFileSync(process.argv[2]).toString().split('\n').forEach(function (line) {
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line = line.trim();
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if( line !== '' ){
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// console.log(line);
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var tmp = line.split(', ');
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var tankers = tmp[0];
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var oil = Number(tmp[1]);
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tankers = tankers.substr(1,tankers.length-2).split(',').reverse();
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min_diff = oil - 1;
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solutions = [];
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for(var i=0, cnt=tankers.length; i < cnt ; i++){
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tankers[i] = Number(tankers[i]);
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}
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efficient_delivery( tankers, 0, oil, new Array( tankers.length + 1 ).join('0').split('') );
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var result = '';
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if( solutions.length ){
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solutions.sort(solution_cmp);
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for(var s=0, max=solutions.length; s < max ; s++){
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result += '[' + solutions[s] + ']';
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}
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}
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else{
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result = min_diff;
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}
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console.log(result);
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}
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});

‎hard/123 - Efficient Delivery/123.php‎

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<?php
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header('Content-Type: text/plain; charset=utf-8');
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// https://www.codeeval.com/open_challenges/123/
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if( isset($_GET['f_i_l_e']) && $_GET['f_i_l_e'] ) $argv[1] = $_GET['f_i_l_e'];
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function efficient_delivery($tankers, $idx, $oil, $allocation){
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global $solutions, $min_diff;
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if( $oil > 0 ){
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$capacity = $tankers[$idx];
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$nb = count($tankers);
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$last_tanker = false;
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if( $capacity ){
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$cnt = ($oil / $capacity)|0;
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$rest = $oil - $cnt * $capacity;
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if( $idx == ($nb-1) ){
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$last_tanker = true;
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if( $rest === 0 ){
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$allocation[$idx] = $cnt;
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$oil = 0;
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}
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else{
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$oil -= $cnt * $capacity;
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}
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}
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else{
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for($i = 0; $i <= $cnt ; $i++ ){
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$allocation[$idx] = $i;
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efficient_delivery($tankers, $idx+1, $oil - $i * $capacity, $allocation);
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}
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}
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}
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if( $last_tanker && $oil ){
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// no more tankers available
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// amount of oil left < amount possible on a tanker
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$diff = INF;
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for($i = 0; $i < $nb ; $i++ ){
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if( $oil < $tankers[$i] ){
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$diff = $tankers[$i] - $oil;
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}
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}
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if( $diff < $min_diff ){
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$min_diff = $diff;
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}
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}
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}
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if( $oil === 0 ){
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// oil = 0
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// ok
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// print_r($allocation);
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$solutions[] = array_reverse($allocation);
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}
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}
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// $t0 = microtime(true);
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function solution_cmp($a,$b){
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$aa = $bb = '';
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for($i=0, $cnt=count($a);$i<$cnt;$i++){
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$aa .= sprintf('%04d', $a[$i]);
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$bb .= sprintf('%04d', $b[$i]);
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}
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return $aa > $bb ? 1 : -1;
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}
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if( isset($argv[1]) && $argv[1] ){
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$filename = $argv[1];
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if( file_exists($filename) ){
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if( is_readable($filename) ){
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$fp = fopen($filename, 'r');
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if( $fp ){
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while ( $fp && !feof( $fp ) ) {
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$line = trim(fgets($fp));
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if( $line ){
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list($tankers, $oil) = explode(', ', $line);
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$tankers = array_reverse(explode(',',substr($tankers,1,-1)));
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$solutions = array();
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$min_diff = $oil;
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// print_r($tankers);
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// echo $oil ."\n";
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efficient_delivery($tankers, 0, $oil, array_fill(0,count($tankers),0) );
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if( $solutions ){
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usort($solutions,'solution_cmp');
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for($i=0, $cnt=count($solutions); $i < $cnt ; $i++){
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echo '['.implode(',', $solutions[$i]).']';
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}
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echo "\n";
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}
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else{
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echo $min_diff . "\n";
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}
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}
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}//
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fclose( $fp );
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}
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else{
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echo '!fp'."\n";
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}
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}
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else{
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echo '!readable'."\n";
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}
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}
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else{
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echo '!file_exists'."\n";
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}
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}
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else{
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echo '!argv[1]'."\n";
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}
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// echo (microtime(true) - $t0) . "\n";
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exit(0);
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?>

‎hard/123 - Efficient Delivery/test.txt‎

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(2,5), 12
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(6,9,20), 44
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(197,8170), 155862
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(2,4,8), 8

‎hard/123 - Efficient Delivery/test2.txt‎

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(197,8170), 155862

‎hard/123 - Efficient Delivery/test3.txt‎

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(193,479,614,690), 7138
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(2716,6130,7782), 168116
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(958,1645,5534), 169731
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(423,826,949,960), 10638
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(97,330,666,715,951), 5155
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(145,537,768,915), 3754
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(175,235,249,363,715), 3460
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(86,327,875,895,911), 6410
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(81,549,571,777), 3238
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(6,9,20), 44
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(180,419,755,962), 5012
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(422,589,633,920,934), 8253
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(1626,2222,9244), 140756
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(180,196,316,523,956), 2588
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(243,478,493,819), 7655
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(2,294,298,817), 2219
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(118,135,431,879,987), 2718
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(2,4,8), 8
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(69,892,973,979), 7226
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(131,416,586,670,936), 3067
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(197,8170), 155862
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(278,484,562,596), 2198
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(277,674), 121318
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(183,342,410,526), 4327
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(5,487,724,805,813), 904
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(102,214,611,748), 3574
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(511,516,734,759,829), 8767
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(74,265,471,713), 4207
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(266,542,732,909), 5451
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(1447,3779,9197), 175226
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(2,5), 12
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(14,118,319,711), 889
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(164,514,871,897,975), 3006
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(407,653,942,998), 11316
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(359,387,589,791), 24415
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(58,222,721,777,956), 2466
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(68,98,651,733,929), 733
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(253,1979,5415), 143535
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(168,176,437,774,834), 4220
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(488,605,703,891,946), 5045

‎hard/123 - Efficient Delivery/test4.txt‎

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(6,9,20), 44

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