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Index.js
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Index.js
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document.addEventListener('DOMContentLoaded', function () {
const gridSize = 9;
const solveButton = document.getElementById("solve-btn");
solveButton.addEventListener('click', solveSudoku);
const sudokuGrid = document.getElementById("sudoku-grid");
// Create the Sudoku Grid and input cells //
for(let row = 0; row < gridSize; row++){
const newRow = document.createElement("tr");
for(let col = 0; col < gridSize; col++){
const cell = document.createElement("td");
const input = document.createElement("input");
input.type = "number";
input.className = "cell";
input.id = `cell-${row}-${col}`;
cell.appendChild(input);
newRow.appendChild(cell);
}
sudokuGrid.appendChild(newRow);
}
});
async function solveSudoku(){
const gridSize = 9;
const sudokuArray = [];
// Fill the sudokuArray with input values from the grid //
for(let row = 0; row < gridSize; row++){
sudokuArray[row] = [];
for(let col = 0; col < gridSize; col++){
const cellId = `cell-${row}-${col}`;
const cellValue = document.getElementById(cellId).value;
sudokuArray[row][col] = cellValue !== "" ? parseInt(cellValue) : 0;
}
}
// Identify user-input cells and mark them //
for(let row = 0; row < gridSize; row++){
for(let col = 0; col < gridSize; col++){
const cellId = `cell-${row}-${col}`;
const cell = document.getElementById(cellId);
if(sudokuArray[row][col] !== 0){
cell.classList.add("user-input");
}
}
}
// Solve the sudoku and display the solution //
if(solveSudokuHelper(sudokuArray)){
for(let row = 0; row < gridSize; row++){
for(let col = 0; col < gridSize; col++){
const cellId = `cell-${row}-${col}`;
const cell = document.getElementById(cellId);
// Fill in the solved values and apply animation //
if(!cell.classList.contains("user-input")){
cell.value = sudokuArray[row][col];
cell.classList.add("solved");
await sleep(20); // Add a delay for visualization //
}
}
}
}else{
alert("No solution exists for this given Sudoku puzzle.");
}
}
function solveSudokuHelper(board){
const gridSize = 9;
for(let row = 0; row < gridSize; row++){
for(let col = 0; col < gridSize; col++){
if(board[row][col] === 0){
for(let num = 1; num <=9; num++){
if(isValidMove(board, row, col, num)){
board[row][col] = num;
// Recursively attempt to solve the Sudoku //
if(solveSudokuHelper(board)){
return true; // Puzzle solved
}
board[row][col] = 0; // Backtrack
}
}
return false; // No valid number found
}
}
}
return true; // All cells filled //
}
function isValidMove(board, row, col, num){
const gridSize = 9;
// Check row and column for Conflicts //
for(let i = 0; i < gridSize; i++){
if(board[row][i] === num || board[i][col] === num){
return false; // Conflict found
}
}
// Check the 3*3 subgrid for conflicts //
const startRow = Math.floor(row / 3) * 3;
const startCol = Math.floor(col / 3) * 3;
for(let i = startRow; i < startRow + 3; i++){
for(let j = startCol; j < startCol + 3; j++){
if(board[i][j] === num){
return false; // Conflict found
}
}
}
return true; // No conflicts found
}
function sleep(ms){
return new Promise(resolve => setTimeout(resolve, ms));
}