From 83e5f7fff7463627cffdb03c985e34f5a47632ed Mon Sep 17 00:00:00 2001
From: miti99 <minhtienit99@gmail.com>
Date: Mon, 16 Mar 2020 10:18:58 +0700
Subject: [PATCH] init commit

---
 sudoku.php | 596 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 596 insertions(+)
 create mode 100644 sudoku.php

diff --git a/sudoku.php b/sudoku.php
new file mode 100644
index 0000000..550b693
--- /dev/null
+++ b/sudoku.php
@@ -0,0 +1,596 @@
+<?php
+class SudokuSolver
+{
+  protected $grid = [];
+  protected $emptySymbol;
+  public static function parseString($str, $emptySymbol = "0")
+  {
+    $grid = str_split($str);
+    foreach ($grid as &$v) {
+      if ($v == $emptySymbol) {
+        $v = 0;
+      } else {
+        $v = (int) $v;
+      }
+    }
+    return $grid;
+  }
+
+  public function __construct($str, $emptySymbol = "0")
+  {
+    if (strlen($str) !== 81) {
+      throw new \Exception("Error sudoku");
+    }
+    $this->grid = static::parseString($str, $emptySymbol);
+    $this->emptySymbol = $emptySymbol;
+  }
+
+  public function solve()
+  {
+    try {
+      $this->placeNumber(0);
+      return false;
+    } catch (\Exception $e) {
+      return true;
+    }
+  }
+
+  protected function placeNumber($pos)
+  {
+    if ($pos == 81) {
+      throw new \Exception("Finish");
+    }
+    if ($this->grid[$pos] > 0) {
+      $this->placeNumber($pos + 1);
+      return;
+    }
+    for ($n = 1; $n <= 9; $n++) {
+      if ($this->checkValidity($n, $pos % 9, floor($pos / 9))) {
+        $this->grid[$pos] = $n;
+        $this->placeNumber($pos + 1);
+        $this->grid[$pos] = 0;
+      }
+    }
+  }
+
+  protected function checkValidity($val, $x, $y)
+  {
+    for ($i = 0; $i < 9; $i++) {
+      if (($this->grid[$y * 9 + $i] == $val) || ($this->grid[$i * 9 + $x] == $val)) {
+        return false;
+      }
+    }
+    $startX = (int) ((int) ($x / 3) * 3);
+    $startY = (int) ((int) ($y / 3) * 3);
+
+    for ($i = $startY; $i < $startY + 3; $i++) {
+      for ($j = $startX; $j < $startX + 3; $j++) {
+        if ($this->grid[$i * 9 + $j] == $val) {
+          return false;
+        }
+      }
+    }
+    return true;
+  }
+
+  public function display()
+  {
+    $str = "";
+    for ($i = 0; $i < 9; $i++) {
+      for ($j = 0; $j < 9; $j++) {
+        $str .= $this->grid[$i * 9 + $j];
+        $str .= " ";
+        if ($j == 2 || $j == 5) {
+          $str .= "| ";
+        }
+      }
+      $str .= PHP_EOL;
+      if ($i == 2 || $i == 5) {
+        $str .=  "------+-------+------" . PHP_EOL;
+      }
+    }
+    echo $str;
+  }
+
+  public function __toString()
+  {
+    foreach ($this->grid as &$item) {
+      if ($item == 0) {
+        $item = $this->emptySymbol;
+      }
+    }
+    return implode("", $this->grid);
+  }
+}
+?>
+
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+
+  <title>Solve Sudoku (Made by MiTiX)</title>
+
+  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet">
+
+  <style type="text/css">
+    html,
+    body {
+      background-color: #FAFAFA
+    }
+
+    table {
+      border: 2px solid #000000;
+    }
+
+    td {
+      border: 1px solid #000000;
+      text-align: center;
+      vertical-align: middle;
+    }
+
+    input {
+      color: #000000;
+      padding: 0;
+      border: 0;
+      text-align: center;
+      width: 48px;
+      height: 48px;
+      font-size: 24px;
+      background-color: #FFFFFF;
+      outline: none;
+    }
+
+    input:disabled {
+      background-color: #EEEEEE;
+    }
+
+    input[type=number]::-webkit-inner-spin-button,
+    input[type=number]::-webkit-outer-spin-button {
+      -webkit-appearance: none;
+      margin: 0;
+    }
+
+    #cell-0,
+    #cell-1,
+    #cell-2 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-2,
+    #cell-11,
+    #cell-20 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-18,
+    #cell-19,
+    #cell-20 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-0,
+    #cell-9,
+    #cell-18 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-3,
+    #cell-4,
+    #cell-5 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-5,
+    #cell-14,
+    #cell-23 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-21,
+    #cell-22,
+    #cell-23 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-3,
+    #cell-12,
+    #cell-21 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-6,
+    #cell-7,
+    #cell-8 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-8,
+    #cell-17,
+    #cell-26 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-24,
+    #cell-25,
+    #cell-26 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-6,
+    #cell-15,
+    #cell-24 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-27,
+    #cell-28,
+    #cell-29 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-29,
+    #cell-38,
+    #cell-47 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-45,
+    #cell-46,
+    #cell-47 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-27,
+    #cell-36,
+    #cell-45 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-30,
+    #cell-31,
+    #cell-32 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-32,
+    #cell-41,
+    #cell-50 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-48,
+    #cell-49,
+    #cell-50 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-30,
+    #cell-39,
+    #cell-48 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-33,
+    #cell-34,
+    #cell-35 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-35,
+    #cell-44,
+    #cell-53 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-51,
+    #cell-52,
+    #cell-53 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-33,
+    #cell-42,
+    #cell-51 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-54,
+    #cell-55,
+    #cell-56 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-56,
+    #cell-65,
+    #cell-74 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-72,
+    #cell-73,
+    #cell-74 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-54,
+    #cell-63,
+    #cell-72 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-57,
+    #cell-58,
+    #cell-59 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-59,
+    #cell-68,
+    #cell-77 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-75,
+    #cell-76,
+    #cell-77 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-57,
+    #cell-66,
+    #cell-75 {
+      border-left: 2px solid #000000;
+    }
+
+    #cell-60,
+    #cell-61,
+    #cell-62 {
+      border-top: 2px solid #000000;
+    }
+
+    #cell-62,
+    #cell-71,
+    #cell-80 {
+      border-right: 2px solid #000000;
+    }
+
+    #cell-78,
+    #cell-79,
+    #cell-80 {
+      border-bottom: 2px solid #000000;
+    }
+
+    #cell-60,
+    #cell-69,
+    #cell-78 {
+      border-left: 2px solid #000000;
+    }
+  </style>
+</head>
+
+<body>
+  <form action="sudoku.php" method="post" style="text-align: center;">
+    <div class="container">
+
+      <h1>Solve Sudoku (Made by MiTiX)</h1>
+
+      <table id="grid" style="margin-left:auto;margin-right:auto;">
+
+        <tr>
+          <td><input id="cell-0" name="cell-0" type="number" min="1" max="9"></td>
+          <td><input id="cell-1" name="cell-1" type="number" min="1" max="9"></td>
+          <td><input id="cell-2" name="cell-2" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-3" name="cell-3" type="number" min="1" max="9"></td>
+          <td><input id="cell-4" name="cell-4" type="number" min="1" max="9"></td>
+          <td><input id="cell-5" name="cell-5" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-6" name="cell-6" type="number" min="1" max="9"></td>
+          <td><input id="cell-7" name="cell-7" type="number" min="1" max="9"></td>
+          <td><input id="cell-8" name="cell-8" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-9" name="cell-9" type="number" min="1" max="9"></td>
+          <td><input id="cell-10" name="cell-10" type="number" min="1" max="9"></td>
+          <td><input id="cell-11" name="cell-11" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-12" name="cell-12" type="number" min="1" max="9"></td>
+          <td><input id="cell-13" name="cell-13" type="number" min="1" max="9"></td>
+          <td><input id="cell-14" name="cell-14" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-15" name="cell-15" type="number" min="1" max="9"></td>
+          <td><input id="cell-16" name="cell-16" type="number" min="1" max="9"></td>
+          <td><input id="cell-17" name="cell-17" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-18" name="cell-18" type="number" min="1" max="9"></td>
+          <td><input id="cell-19" name="cell-19" type="number" min="1" max="9"></td>
+          <td><input id="cell-20" name="cell-20" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-21" name="cell-21" type="number" min="1" max="9"></td>
+          <td><input id="cell-22" name="cell-22" type="number" min="1" max="9"></td>
+          <td><input id="cell-23" name="cell-23" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-24" name="cell-24" type="number" min="1" max="9"></td>
+          <td><input id="cell-25" name="cell-25" type="number" min="1" max="9"></td>
+          <td><input id="cell-26" name="cell-26" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-27" name="cell-27" type="number" min="1" max="9"></td>
+          <td><input id="cell-28" name="cell-28" type="number" min="1" max="9"></td>
+          <td><input id="cell-29" name="cell-29" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-30" name="cell-30" type="number" min="1" max="9"></td>
+          <td><input id="cell-31" name="cell-31" type="number" min="1" max="9"></td>
+          <td><input id="cell-32" name="cell-32" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-33" name="cell-33" type="number" min="1" max="9"></td>
+          <td><input id="cell-34" name="cell-34" type="number" min="1" max="9"></td>
+          <td><input id="cell-35" name="cell-35" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-36" name="cell-36" type="number" min="1" max="9"></td>
+          <td><input id="cell-37" name="cell-37" type="number" min="1" max="9"></td>
+          <td><input id="cell-38" name="cell-38" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-39" name="cell-39" type="number" min="1" max="9"></td>
+          <td><input id="cell-40" name="cell-40" type="number" min="1" max="9"></td>
+          <td><input id="cell-41" name="cell-41" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-42" name="cell-42" type="number" min="1" max="9"></td>
+          <td><input id="cell-43" name="cell-43" type="number" min="1" max="9"></td>
+          <td><input id="cell-44" name="cell-44" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-45" name="cell-45" type="number" min="1" max="9"></td>
+          <td><input id="cell-46" name="cell-46" type="number" min="1" max="9"></td>
+          <td><input id="cell-47" name="cell-47" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-48" name="cell-48" type="number" min="1" max="9"></td>
+          <td><input id="cell-49" name="cell-49" type="number" min="1" max="9"></td>
+          <td><input id="cell-50" name="cell-50" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-51" name="cell-51" type="number" min="1" max="9"></td>
+          <td><input id="cell-52" name="cell-52" type="number" min="1" max="9"></td>
+          <td><input id="cell-53" name="cell-53" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-54" name="cell-54" type="number" min="1" max="9"></td>
+          <td><input id="cell-55" name="cell-55" type="number" min="1" max="9"></td>
+          <td><input id="cell-56" name="cell-56" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-57" name="cell-57" type="number" min="1" max="9"></td>
+          <td><input id="cell-58" name="cell-58" type="number" min="1" max="9"></td>
+          <td><input id="cell-59" name="cell-59" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-60" name="cell-60" type="number" min="1" max="9"></td>
+          <td><input id="cell-61" name="cell-61" type="number" min="1" max="9"></td>
+          <td><input id="cell-62" name="cell-62" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-63" name="cell-63" type="number" min="1" max="9"></td>
+          <td><input id="cell-64" name="cell-64" type="number" min="1" max="9"></td>
+          <td><input id="cell-65" name="cell-65" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-66" name="cell-66" type="number" min="1" max="9"></td>
+          <td><input id="cell-67" name="cell-67" type="number" min="1" max="9"></td>
+          <td><input id="cell-68" name="cell-68" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-69" name="cell-69" type="number" min="1" max="9"></td>
+          <td><input id="cell-70" name="cell-70" type="number" min="1" max="9"></td>
+          <td><input id="cell-71" name="cell-71" type="number" min="1" max="9"></td>
+        </tr>
+
+        <tr>
+          <td><input id="cell-72" name="cell-72" type="number" min="1" max="9"></td>
+          <td><input id="cell-73" name="cell-73" type="number" min="1" max="9"></td>
+          <td><input id="cell-74" name="cell-74" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-75" name="cell-75" type="number" min="1" max="9"></td>
+          <td><input id="cell-76" name="cell-76" type="number" min="1" max="9"></td>
+          <td><input id="cell-77" name="cell-77" type="number" min="1" max="9"></td>
+
+          <td><input id="cell-78" name="cell-78" type="number" min="1" max="9"></td>
+          <td><input id="cell-79" name="cell-79" type="number" min="1" max="9"></td>
+          <td><input id="cell-80" name="cell-80" type="number" min="1" max="9"></td>
+        </tr>
+
+      </table>
+
+      <input type="submit" style="width: 100%;" value="Solve" name="solve"><br>
+
+    </div>
+  </form>
+  <?php
+  if (isset($_POST["solve"])) {
+    $input = "000000000000000000000000000000000000000000000000000000000000000000000000000000000";
+    for ($i = 0; $i < 81; $i++) {
+      if (isset($_POST["cell-{$i}"])) {
+        $input[$i] = $_POST["cell-{$i}"];
+      }
+    }
+  ?>
+    <form style="text-align: center;">
+      <div class="container">
+
+        <h1>Input</h1>
+
+        <table id="grid" style="margin-left:auto;margin-right:auto;">
+          <?php
+          $i = 0;
+          while ($i < 81) {
+            if ($i % 9 == 0) {
+          ?>
+              <tr>
+              <?php
+            }
+            $id = "cell-{$i}";
+              ?>
+              <td><input id="<?php echo $id; ?>" type="number" min="1" max="9" <?php if ($input[$i] != 0) { ?> value="<?php echo $input[$i]; ?>" disabled <?php } ?>></td>
+              <?php
+              if ($i % 9 == 8) {
+              ?>
+              </tr>
+          <?php
+              }
+              $i++;
+            }
+          ?>
+        </table>
+      </div>
+    </form>
+    <?php
+    $solver = new SudokuSolver($input);
+    $solver->solve();
+    $output = (string) $solver;
+    ?>
+
+    <form style="text-align: center;">
+      <div class="container">
+
+        <h1>Output</h1>
+
+        <table id="grid" style="margin-left:auto;margin-right:auto;">
+          <?php
+          $i = 0;
+          while ($i < 81) {
+            if ($i % 9 == 0) {
+          ?>
+              <tr>
+              <?php
+            }
+            $id = "cell-{$i}";
+              ?>
+              <td><input id="<?php echo $id; ?>" type="number" min="1" max="9" value="<?php echo $output[$i]; ?>" disabled></td>
+              <?php
+              if ($i % 9 == 8) {
+              ?>
+              </tr>
+        <?php
+              }
+              $i++;
+            }
+          }
+        ?>
+        </table>
+      </div>
+    </form>
+
+</body>
+
+</html>
+
+<br>Made by @MiTiX
+<br>source: https://rosettacode.org/wiki/Sudoku
+<br>source: https://gist.github.com/thebinarypenguin/4d45ffe87096e508800b5d11544bf2fa
\ No newline at end of file