This is NOT a homework question, actually I am doing this for fun.
Here is the problem:
I have one classroom with a specified “width” (in chairs), and I must place all student so there is no conversation in the classroom.
There is a conversation if one student is next to the other. (Diagonals count)
For this example, the classroom width is 3. Let’s say that we have some students: Matheus, Gabriel and Ravi, they all talk to each other, now we have the other students, A, B, C, D, E, F.
A solution for the above problem would be:
|---------|--------|---------|
| Gabriel | A | Matheus |
|---------|--------|---------|
| B | C | D |
|---------|--------|---------|
| Ravi | E | F |
|---------|--------|---------|
My actual code is this, but for some reason it crashes the browser (infinite loop):
/*
Class Classroom
*/
function Classroom($width){
$width=$width||6;
var self=this;
var alunos=[];
self.addClassmate=function($classmate){
alunos.push($classmate);
}
self.createClassroom=function(){
var mapa=[];
var width=$width;
var height=Math.ceil(alunos.length/width);
for(var i=0;i<width;++i){
mapa[i]=[];
}
// Shuffle the array
alunos.sort(function(a,b){
return 0.5 - Math.random();
});
var i=0;
var px=width;
var py=height;
// Fill the array
while(px--){
while(py--){
if(i<alunos.length){
mapa[px][py]=alunos[i];
}else{
mapa[px][py]=new Student('---');
}
++i;
}
py=height;
}
function changePosition(px,py){
var dx=Math.floor(Math.random()*width);
var dy=Math.floor(Math.random()*height);
var me=mapa[px][py];
var other=mapa[dx][dy];
mapa[dx][dy]=me;
mapa[px][py]=other;
alert('lol');
checkChairs();
}
// DO IT
function checkChairs(){
for(var px=0;px<width;++px){
for(var py=0;py<height;++py){
var me=mapa[px][py];
var leftCorner = px==0;
var rightCorner = px==width-1;
var topCorner = py==0;
var bottomCorner = py==height-1;
if(!leftCorner){
if(mapa[px-1][py].hasRelationWith(me)){
changePosition(px,py);
return;
}
if(!topCorner){
if(mapa[px-1][py-1].hasRelationWith(me)){
changePosition(px,py);
return;
}
}
if(!bottomCorner){
if(mapa[px-1][py+1].hasRelationWith(me)){
return;
}
}
}
if(!rightCorner){
if(mapa[px+1][py].hasRelationWith(me)){
changePosition(px,py);
return;
}
if(!topCorner){
if(mapa[px+1][py-1].hasRelationWith(me)){
changePosition(px,py);
return;
}
}
if(!bottomCorner){
if(mapa[px+1][py+1].hasRelationWith(me)){
changePosition(px,py);
return;
}
}
}
if(!topCorner){
if(mapa[px][py-1].hasRelationWith(me)){
changePosition(px,py);
return;
}
}
if(!bottomCorner){
if(mapa[px][py+1].hasRelationWith(me)){
changePosition(px,py);
return;
}
}
}
}
}
checkChairs();
return mapa;
}
}
/*
Class Student
*/
function Student($name){
var self=this;
var name=$name;
var relation=[];
self.addRelationWith=function($classmate,$mutual){
$mutual=$mutual||true;
if(self.hasRelationWith($classmate)) return;
relation.push($classmate);
if($mutual){
$classmate.addRelationWith(self, false);
}
}
self.hasRelationWith=function($classmate){
var i=relation.length;
while(i--){
if(relation[i]==$classmate){
return true;
}
}
return false;
}
self.getName=function(){
return name;
}
self.toString=function(){
return '[Student '+self.getName()+']';
}
}
var s=new Classroom(3);
var Matheus=new Student('Matheus');
var Gabriel=new Student('Gabriel');
var Ravi=new Student('Ravi');
Matheus.addRelationWith(Gabriel);
Matheus.addRelationWith(Ravi);
Gabriel.addRelationWith(Ravi);
s.addClassmate(Matheus);
s.addClassmate(Gabriel);
s.addClassmate(Ravi);
s.addClassmate('A');
s.addClassmate('B');
s.addClassmate('C');
s.addClassmate('D');
s.addClassmate('E');
s.addClassmate('F');
alert(s.createClassroom());
(The example I gave in this post is in the end of the code)
LOL! I can’t believe this, I was passing strings instead of Students to the function.
Here is the correct code:
I need moar coffee…