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reverse direction compared to part1

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Baipyrus 2023-12-09 22:43:48 +01:00
parent 2d980c7717
commit bc9d1b45f4
1 changed files with 5 additions and 5 deletions
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10
Day9/Part2.js
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@ -20,13 +20,13 @@ const predictions = histories.map((e) => {
}, []); }, []);
} }
const last = sequences.pop(); const last = sequences.pop();
const extrapolated = [[...last, last[0]]]; let extrapolated = [last[0], ...last];
for (const s of sequences.reverse()) { for (const s of sequences.reverse()) {
const current = s.pop(); const current = s.shift();
const last = extrapolated.pop().pop(); const last = extrapolated.shift();
extrapolated.push([...s, current + last]); extrapolated = [current - last, ...s];
} }
return extrapolated.pop().pop(); return extrapolated.shift();
}); });
const sum = predictions.reduce((a, i) => a + i); const sum = predictions.reduce((a, i) => a + i);
console.log(sum); console.log(sum);