Nick Thomas
f1be11fca8
git-subtree-dir: 2020 git-subtree-mainline:ab8f135946git-subtree-split:aaabfa90c9
33 lines
798 B
JavaScript
33 lines
798 B
JavaScript
const fs = require('fs');
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fs.readFile('input', (err, data) => {
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if (err) throw err;
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let input = data.toString().trim().split("\n").map((line) => Number(line) );
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let builtIn = Math.max(...input) + 3;
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let adapters = new Set ( input );
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let jolts = 0;
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let diff1s = 0;
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let diff3s = 1; // The built-ion adapter
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for (i=0; i < input.length; i++) {
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// All entries are unique, so no need to worry about jolts+0
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if (adapters.has(jolts+1)) {
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diff1s++;
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adapters.delete(jolts+1);
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jolts++;
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} else if (adapters.has(jolts+2)) {
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adapters.delete(jolts+2);
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jolts+=2;
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} else if (adapters.has(jolts+3)) {
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diff3s++;
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adapters.delete(jolts+3);
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jolts+=3;
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} else {
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throw ("oh no");
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}
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};
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console.log(diff1s * diff3s);
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});
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