fork download
copy 
  1.   <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5.  
  6. $total = 7;
  7. $step  = 4;
  8.  
  9. $citizens  = range(1, $total);
  10. $positions = array_combine($citizens, $citizens);
  11. print_r($positions);
  12.  
  13. while (count($positions) >= $step) {
  14.  
  15.     for ($i = 1; $i < $step; $i++) {
  16.         $cur = next($positions);
  17.  
  18.         if ($cur === false) {
  19.         	echo "the $i iteration - reached the end. Rewinding...\n";
  20.            $cur = reset($positions);
  21.             echo "now current is ".current($positions)."\n";
  22.  
  23.         }
  24.     }
  25.     echo "deleting $cur. \n";
  26.     unset($positions[$cur]);
  27.  
  28.     if (current($positions) === false) {
  29.         reset($positions);
  30.     }
  31.  
  32.       echo "count will now start from " . current($positions) . "\n";
  33.       echo "The people still in game:\n";
  34.       print_r($positions);
  35. }
  36. echo "Выигрышные места: ";
  37. echo implode(", ", array_values($positions)) . ". \n";
  38.  
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
  Array
(
    [1] => 1
    [2] => 2
    [3] => 3
    [4] => 4
    [5] => 5
    [6] => 6
    [7] => 7
)
deleting 4. 
count will now start from 5
The people still in game:
Array
(
    [1] => 1
    [2] => 2
    [3] => 3
    [5] => 5
    [6] => 6
    [7] => 7
)
the 3 iteration - reached the end. Rewinding...
now current is 1
deleting 1. 
count will now start from 2
The people still in game:
Array
(
    [2] => 2
    [3] => 3
    [5] => 5
    [6] => 6
    [7] => 7
)
deleting 6. 
count will now start from 7
The people still in game:
Array
(
    [2] => 2
    [3] => 3
    [5] => 5
    [7] => 7
)
the 1 iteration - reached the end. Rewinding...
now current is 2
deleting 5. 
count will now start from 7
The people still in game:
Array
(
    [2] => 2
    [3] => 3
    [7] => 7
)
Выигрышные места: 2, 3, 7.
https://ideone.com/2Gp5Vt
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!