32 lines
601 B
JavaScript
32 lines
601 B
JavaScript
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var grid = require("fs").readFileSync("input.txt").toString().split("\n").filter(a=>(a)).reverse().map(a=>(a.split("")));
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var dirs = [[0, 1], [1, 0], [0, -1], [-1, 0]];
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var dir = 0;
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var x = Math.floor(grid.length/2);
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var y = Math.floor(grid.length/2);
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var numInfected = 0;
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for(var i = 0; i < 10000; i++){
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var clean = true;
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if(grid[y]){
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if(grid[y][x] == "#"){
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clean = false;
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}
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}
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else{
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grid[y] = [];
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}
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if(clean){
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grid[y][x] = "#";
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numInfected++;
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dir--;
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}
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else{
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grid[y][x] = ".";
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dir++;
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}
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dir = (dir+4)%4;
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x += dirs[dir][0];
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y += dirs[dir][1];
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}
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console.log(numInfected);
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