67 lines
1.9 KiB
JavaScript
67 lines
1.9 KiB
JavaScript
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var maps = {};
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for(var map of require("fs").readFileSync("input.txt").toString().split("\n").filter(a=>(a))){
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map = map.split(" => ");
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maps[map[0]] = map[1];
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}
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for(var i = 0; i < 1; i++){
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for(var input of Object.keys(maps)){
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var lines = input.split("/");
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rotated = input.split("/").map((line,y)=>(line.split("").map((a, x)=>(lines[lines.length-1-x][y])).join(""))).join("/");
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maps[rotated] = maps[input];
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}
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}
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for(var input of Object.keys(maps)){
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maps[input.split("/").reverse().join("/")] = maps[input];
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}
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for(var input of Object.keys(maps)){
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maps[input.split("/").map(line=>(line.split("").reverse().join(""))).join("/")] = maps[input];
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}
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function runRound(textInput){
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var oldGrid = textInput.split("/").map((a)=>(a.split("")));
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var sideLen = oldGrid[0].length;
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if(sideLen%2 == 0){
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var sideSquares = sideLen/2;
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var squareLen = 2;
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var newSquareLen = 3;
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}
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else if(sideLen%3 == 0){
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var sideSquares = sideLen/3;
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var squareLen = 3;
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var newSquareLen = 4;
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}
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var newGrid = [];
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for(var i = 0; i < (sideSquares * newSquareLen); i++){
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newGrid[i] = [];
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}
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for(var x = 0; x < sideSquares; x++){
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for(var y = 0; y < sideSquares; y++){
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var section = [];
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for(var i = 0; i < squareLen; i++){
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section.push(oldGrid[(y*squareLen) + i].slice(x*squareLen, (x+1)*squareLen));
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}
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var sectionText = section.map((a)=>(a.join(""))).join("/");
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var newSectionText = maps[sectionText];
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var newSection = newSectionText.split("/").map(a=>(a.split("")));
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for(var x1 = 0; x1 < newSquareLen; x1++){
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for(var y1= 0; y1 < newSquareLen; y1++){
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newGrid[(y*newSquareLen) + y1][(x*newSquareLen) + x1] = newSection[y1][x1];
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}
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}
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}
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}
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return newGrid.map(a=>(a.join(""))).join("/")
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}
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var currentGrid = ".#./..#/###";
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var iters = 18;
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for(var i = 0; i < iters; i++){
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currentGrid = runRound(currentGrid);
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}
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console.log(currentGrid.split("").filter(a=>(a=="#")).length);
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