From bb891df640cabc92f7cba229e5f745b504f99b45 Mon Sep 17 00:00:00 2001
From: Shadab Ali <shadabali604@gmail.com>
Date: Mon, 12 Oct 2020 13:34:41 +0530
Subject: [PATCH] Added: Sodoko Solver In DP (#420)

* Added: Sodoko Solver In DP

* added: space remove

* Chnage code accoding to npm standards.

* Change

* Update: All Issue Fix

* Update SudokuSolver.js

Co-authored-by: vinayak <itssvinayak@gmail.com>
---
 Dynamic-Programming/SudokuSolver.js | 50 +++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Dynamic-Programming/SudokuSolver.js

diff --git a/Dynamic-Programming/SudokuSolver.js b/Dynamic-Programming/SudokuSolver.js
new file mode 100644
index 000000000..bbba70e7b
--- /dev/null
+++ b/Dynamic-Programming/SudokuSolver.js
@@ -0,0 +1,50 @@
+const _board = [
+  ['.', '9', '.', '.', '4', '2', '1', '3', '6'],
+  ['.', '.', '.', '9', '6', '.', '4', '8', '5'],
+  ['.', '.', '.', '5', '8', '1', '.', '.', '.'],
+  ['.', '.', '4', '.', '.', '.', '.', '.', '.'],
+  ['5', '1', '7', '2', '.', '.', '9', '.', '.'],
+  ['6', '.', '2', '.', '.', '.', '3', '7', '.'],
+  ['1', '.', '.', '8', '.', '4', '.', '2', '.'],
+  ['7', '.', '6', '.', '.', '.', '8', '1', '.'],
+  ['3', '.', '.', '.', '9', '.', '.', '.', '.']
+]
+
+const isValid = (board, row, col, k) => {
+  for (let i = 0; i < 9; i++) {
+    const m = 3 * Math.floor(row / 3) + Math.floor(i / 3)
+    const n = 3 * Math.floor(col / 3) + i % 3
+    if (board[row][i] === k || board[i][col] === k || board[m][n] === k) {
+      return false
+    }
+  }
+  return true
+}
+
+const sodokoSolver = (data) => {
+  for (let i = 0; i < 9; i++) {
+    for (let j = 0; j < 9; j++) {
+      if (data[i][j] === '.') {
+        for (let k = 1; k <= 9; k++) {
+          if (isValid(data, i, j, k)) {
+            data[i][j] = `${k}`
+            if (sodokoSolver(data)) {
+              return true
+            } else {
+              data[i][j] = '.'
+            }
+          }
+        }
+        return false
+      }
+    }
+  }
+  return true
+}
+
+// testing
+(() => {
+  if (sodokoSolver(_board)) {
+    console.log(_board)
+  }
+})()