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day24.js
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day24.js
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var fs = require('fs');
calculate();
function calculate(){
var fileName = 'input.txt';
var file = fs.readFileSync(fileName);
var lines = file.toString().split('\r\n');
var grid = [];
var y=0;
lines.forEach(function(line){
var x=0;
var cells = line.split('');
var gridLine=[];
cells.forEach(function(cell){
gridLine.push(new Case(x,y,cell));
x++;
});
y++;
grid.push(gridLine);
});
var found=false;
var historique=[];
historique.push(grid);
while(!found){
grid = copulate(grid);
historique.push(grid);
var indexH=0;
historique.forEach(function(gridH){
var indexS=0;
historique.forEach(function(gridS){
if(indexH!=indexS){
if(equals(gridH,gridS)){
found=true;
console.log(indexS+" "+indexH);
console.log(show(gridH));
console.log(show(gridS));
console.log(biodiversityRating(gridH));
}
}
indexS++;
});
indexH++;
});
}
//console.log(show());
}
function show(grid){
var string = "";
grid.forEach(function(line){
line.forEach(function(cell){
string+=cell.content;
});
string+="\n";
});
return(string);
}
function copulate(grid){
var copy = [];
var y=0;
grid.forEach(function(line){
var x=0;
var gridLine=[];
line.forEach(function(cell){
var adjacells = getAdjacells(grid,x,y);
var countBugs = 0;
adjacells.forEach(function(c){
if(c.content=='#'){
countBugs++;
}
});
if(cell.content=='#' && countBugs != 1){
//console.log(adjacells);
//console.log(x+" "+y+" "+countBugs);
gridLine.push(new Case(x,y,'.'));
}else if(cell.content == '.' && (countBugs == 1 || countBugs == 2) ){
gridLine.push(new Case(x,y,'#'));
}else{
gridLine.push(new Case(x,y,cell.content));
}
x++;
});
y++;
copy.push(gridLine);
});
return copy;
}
function getAdjacells(grid,x,y){
var ret=[];
if(x+1<grid[0].length){
ret.push(grid[y][x+1]);
}
if(y+1<grid.length){
ret.push(grid[y+1][x]);
}
if(x-1>=0){
ret.push(grid[y][x-1]);
}
if(y-1>=0){
ret.push(grid[y-1][x]);
}
return ret;
}
function Case(x,y,content){
this.x=x;
this.y=y;
this.content=content;
}
function equals(grid1,grid2){
var equals=true;
var y=0;
while(y<grid1.length && equals){
var x=0;
while(x<grid1[0].length && equals){
if(grid1[y][x].content!=grid2[y][x].content){
equals=false;
}
x++;
}
y++;
}
return equals;
}
function biodiversityRating(grid){
var chiffre=1;
var total = 0;
grid.forEach(function(line){
line.forEach(function(cell){
if(cell.content=='#'){
total+=chiffre;
}
chiffre*=2;
});
});
return total;
}