31 lines
730 B
JavaScript
31 lines
730 B
JavaScript
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var input = require("fs").readFileSync("input.txt").toString().replace("\n", "");
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var dirs = input.split(",");
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var replacements = [
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[["n", "s"], ""],
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[["ne", "sw"], ""],
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[["nw", "se"], ""],
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[["ne", "nw"], "n"],
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[["se", "sw"], "s"],
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[["ne", "s"], "se"],
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[["se", "n"], "ne"],
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[["sw", "n"], "nw"],
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[["nw", "s"], "sw"],
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];
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var oldlength = 0;
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while(dirs.length != oldlength){
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oldlength = dirs.length;
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for(var replacement of replacements){
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if(dirs.indexOf(replacement[0][0]) > -1 && dirs.indexOf(replacement[0][1]) > -1){
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dirs.splice(dirs.indexOf(replacement[0][0]), 1);
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dirs.splice(dirs.indexOf(replacement[0][1]), 1);
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if(replacement[1]){
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dirs.push(replacement[1]);
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}
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}
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}
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}
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console.log(dirs.length);
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