38 lines
825 B
JavaScript
38 lines
825 B
JavaScript
let fs = require("fs");
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let input = fs.readFileSync("inputs.txt", "utf8").split('');
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function swapCase(c) {
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return c === c.toUpperCase() ? c.toLowerCase() : c.toUpperCase();
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}
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function collapsePolymer(polymer) {
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let i = 0;
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while(i < polymer.length - 1) {
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if (polymer[i] === swapCase(polymer[i + 1])) {
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polymer.splice(i, 2);
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i = Math.max(-1, i - 2);
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}
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i++;
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}
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return polymer.length;
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}
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let shortest = Math.min(...
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'abcdefghijklmnopqrstuvwxyz'
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.split('')
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.map(
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x => collapsePolymer(
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input.filter(
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y => y.toUpperCase() !== x.toUpperCase()
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)
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)
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)
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);
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console.log(`[Part 1] Polymer length: ${ collapsePolymer(input) }`);
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console.log(`[Part 2] Shortest polymer length: ${ shortest }`);
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