Submission #1433444

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Source Code Expand

<?php
$array = explode(" ", trim(fgets(STDIN)));
$N = $array[0];
$x = $array[1];
$ans = "Yes";
if(($x == 1) || ($x == 2 * $N - 1)) $ans = "No";
if($ans == "Yes") {
  print($ans);
  print("\n");
  $block = array();
  if($N == 2) {
    $block[0] = 1;
    $block[1] = 2;
    $block[2] = 3;
  } else {
    $q = array();
    if($x < 2 * $N - 2) {
      for($i = 1; $i < 2 * $N; $i++) {
        if(($i != $x - 1) && ($i != $x) && ($i != $x + 1) && ($i != $x + 2)) $q[] = $i;
      }
      $index = 0;
      for($i = 0; $i < 2 * $N - 1; $i++) {
        if($i == $N - 3) {
          $block[$i] = $x + 2;
        } else if($i == $N - 2) {
          $block[$i] = $x - 1;
        } else if($i == $N - 1) {
          $block[$i] = $x;
        } else if($i == $N) {
          $block[$i] = $x + 1;
        } else {
          $block[$i] = $q[$index];
          $index++;
        }
      }
    } else {
      for($i = 1; $i < 2 * $N; $i++) {
        if(($i != $x + 1) && ($i != $x) && ($i != $x - 1) && ($i != $x - 2)) $q[] = $i;
      }
      $index = 0;
      for($i = 0; $i < 2 * $N - 1; $i++) {
        if($i == $N - 3) {
          $block[$i] = $x - 2;
        } else if($i == $N - 2) {
          $block[$i] = $x + 1;
        } else if($i == $N - 1) {
          $block[$i] = $x;
        } else if($i == $N) {
          $block[$i] = $x - 1;
        } else {
          $block[$i] = $q[$index];
          $index++;
        }
      }
    }
  }
  for($i = 0; $i < 2 * $N - 1; $i++) {
    print($block[$i]);
    print("\n");
  }
} else {
  print($ans);
}
?>

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