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37 lines
635 B
JavaScript
37 lines
635 B
JavaScript
const input = "9,3,1,0,8,4";
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const start = input.split(",");
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const memory = {};
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let turn = 1;
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let lastNum = null;
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for (const num of start) {
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if (lastNum !== null) {
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memory[lastNum] = turn - 1;
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}
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lastNum = num;
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console.log(`Turn ${turn}: ${num}`);
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turn += 1;
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}
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let num;
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while (turn <= 2020) {
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if (typeof memory[lastNum] === "undefined") {
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num = 0;
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} else {
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num = turn - 1 - memory[lastNum];
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}
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console.log(
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`Turn ${turn}: ${num}${
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num !== 0 ? ` (${turn - 1} - ${memory[lastNum]})` : ""
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}`
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);
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memory[lastNum] = turn - 1;
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lastNum = num;
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turn += 1;
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}
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console.log("Solution:", num);
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