20 lines
697 B
JavaScript
20 lines
697 B
JavaScript
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const fs = require('fs');
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const inputArray = fs.readFileSync('input.txt').toString().split(",").map(Number);
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function countFish(days) {
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const fishPerDay = new Array(9).fill(0); // Array of number of fish at each day remaining
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inputArray.forEach(f => (fishPerDay[f]++)); // Populate the array based on the input
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for (let d = 0; d < days; d++){
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const fish = fishPerDay.shift(); // The number of fish at zero
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(fishPerDay.push(fish)) && (fishPerDay[6] += fish); // Put that many fish at eight and add this number to six
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}
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return fishPerDay.reduce((a, b) => a + b, 0); // add up all the fish
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}
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// Part One
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console.log(countFish(80));
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// Part Two
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console.log(countFish(256));
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