/**
* Given a Boggle board and a dictionary, returns a list of available words in
* the dictionary present inside of the Boggle board.
* @param {string[][]} grid - The Boggle game board.
* @param {string[]} dictionary - The list of available words.
* @returns {string[]} solutions - Possible solutions to the Boggle board.
*/
exports.findAllSolutions = function(grid, dictionary) {
let solutions = [];
converttolowercase(grid,dictionary);
let trie = MakeTrie(dictionary);
if(grid == null || dictionary == null){
return solutions;
}
let N = grid.length;
if(N==0){
return solutions;
console.log(N);
}
for(let i=0; i<N;i++){
if(grid[i].length!= N ){
return solutions;
}
}
//let trie=new Set(dictionary);
let solutionset=new Set();
for(let y= 0; y<N ; y++){
for(let x= 0; x<N ; x++){
let word= "";
let visited = new Array(N).fill(false).map(() => new Array(N).fill(false));
findwords(word,x,y,grid,visited,trie,solutionset);
}
}
solutions= Array.from(solutionset)
return solutions;
}
////////////////////////////////////////////////////////////////////////
var TrieNode = function(value) {
this.value=value;
this.children = new Array();
this.isWord = false;
};
//////////////////////////////////////////////////////////////////////////////
var MakeTrie = function(dict) {
var root = new TrieNode('');
if(dict.length==0){
return;
}
for(let words of dict){
var node = root;
for(let i =0;i<words.length;i++){
var letter = words[i];
var ord = letter.charCodeAt(0) - 97;
var curNode = node.children[ord];
if(node.children[ord]== undefined){
var curNode = new TrieNode(letter);
node.children[ord]=curNode;
}
node=curNode;
}
node.isWord=true;
}
return root;
};
//////////////////////////////////////////////////////////////////////////////
findwords=function(word,x,y,grid,visited,trie,solutionset){
//let triee = MakeTrie(dictionary);
let adjacentMatrix =[[0,1],[1,0],[0,-1],[-1,0],[1,1],[-1,1],[1,-1],[-1,-1]];
if(y<0 || x<0 || y>=grid.length || x >=grid.length || visited[x][y]==true){
return;
}
word += grid[x][y];
if(isprefix(word,trie)){
visited[x][y]=true;
if (isword(word,trie)){
if(word.length>2){
solutionset.add(word);
}
}
for(let i=0;i<8;i++){
findwords(word,x+adjacentMatrix[i][0],y+adjacentMatrix[i][1],grid,visited,trie,solutionset)
}
}
visited[x][y]=false
}
////////////////////////////////////////////////////////////////////
isprefix= function(word,trie){
/*//console.log(trie);
for(let tword of trie){
if(tword.substr(0,word.length)==word){
//console.log(tword.substr(0,word.length))
return true
}
}
return false;*/
let subword=''
let curNode=trie;
for(let i =0;i<word.length;i++){
if(curNode!=undefined){
for(let node of curNode.children){
if(node!=undefined && node.value==word[i]){
subword+=word[i];
curNode=node;
break;
}
}
}
}
if(word==subword){
return true;
}
return false;
}
isword= function(word,trie){
let subword=''
let curNode=trie;
for(let i =0;i<word.length;i++){
if(curNode!=undefined){
for(let node of curNode.children){
if(node!=undefined && node.value==word[i]){
subword+=word[i];
curNode=node;
break;
}
}
}
}
if(word==subword && curNode.isWord==true){
return true;
}
return false;
}
////////////////////////////////////////////////////////////////////
converttolowercase=function(grid,dict){
for(let i=0;i<grid.length;i++){
for(let j=0;j<grid.length;j++){
if(grid[i][j]){
grid[i][j]= grid[i][j].toLowerCase();
}
}
}
for(let j=0;j<dict.length;j++){
dict[j]=dict[j].toLowerCase();
}
}
////////////////////////////////////////////////////////////////////
var grid = [ ['t', 'w', 'y', 'r'],
['e', 'n', 'p', 'h'],
['g', 'z', 'qu','r'],
['o', 'n', 't', 'a']];
var dictionary = ['art', 'ego', 'gent', 'get', 'net', 'new', 'newt', 'prat',
'pry', 'qua', 'quart', 'quartz', 'rat', 'tar', 'tarp',
'ten', 'went', 'wet', 'arty', 'egg', 'not', 'quar'];
console.log(exports.findAllSolutions(grid, dictionary));
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Javascript(JS) is a object-oriented programming language which adhere to ECMA Script Standards. Javascript is required to design the behaviour of the web pages.
var readline = require('readline');
var rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
terminal: false
});
rl.on('line', function(line){
console.log("Hello, " + line);
});
| Keyword | Description | Scope |
|---|---|---|
| var | Var is used to declare variables(old way of declaring variables) | Function or global scope |
| let | let is also used to declare variables(new way) | Global or block Scope |
| const | const is used to declare const values. Once the value is assigned, it can not be modified | Global or block Scope |
let greetings = `Hello ${name}`
const msg = `
hello
world!
`
An array is a collection of items or values.
let arrayName = [value1, value2,..etc];
// or
let arrayName = new Array("value1","value2",..etc);
let mobiles = ["iPhone", "Samsung", "Pixel"];
// accessing an array
console.log(mobiles[0]);
// changing an array element
mobiles[3] = "Nokia";
Arrow Functions helps developers to write code in concise way, it’s introduced in ES6.
Arrow functions can be written in multiple ways. Below are couple of ways to use arrow function but it can be written in many other ways as well.
() => expression
const numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
const squaresOfEvenNumbers = numbers.filter(ele => ele % 2 == 0)
.map(ele => ele ** 2);
console.log(squaresOfEvenNumbers);
let [firstName, lastName] = ['Foo', 'Bar']
let {firstName, lastName} = {
firstName: 'Foo',
lastName: 'Bar'
}
const {
title,
firstName,
lastName,
...rest
} = record;
//Object spread
const post = {
...options,
type: "new"
}
//array spread
const users = [
...adminUsers,
...normalUsers
]
function greetings({ name = 'Foo' } = {}) { //Defaulting name to Foo
console.log(`Hello ${name}!`);
}
greet() // Hello Foo
greet({ name: 'Bar' }) // Hi Bar
IF is used to execute a block of code based on a condition.
if(condition){
// code
}
Else part is used to execute the block of code when the condition fails.
if(condition){
// code
} else {
// code
}
Switch is used to replace nested If-Else statements.
switch(condition){
case 'value1' :
//code
[break;]
case 'value2' :
//code
[break;]
.......
default :
//code
[break;]
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
//code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while (condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
ES6 introduced classes along with OOPS concepts in JS. Class is similar to a function which you can think like kind of template which will get called when ever you initialize class.
class className {
constructor() { ... } //Mandatory Class method
method1() { ... }
method2() { ... }
...
}
class Mobile {
constructor(model) {
this.name = model;
}
}
mbl = new Mobile("iPhone");