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gioiliop7/apli_analogiki.js

Last active May 23, 2023 22:20
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Calculate the seats in "Apli Analogiki" elections format, in greek elections
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apli_analogiki.js
function distributeSeats(percentages, totalSeats, threshold) {
const validParties = percentages.filter((percentage) => percentage >= threshold);
const totalValidPercentages = validParties.reduce((a, b) => a + b, 0);
const seatDistribution = [];
validParties.forEach((percentage) => {
const seats = Math.floor((percentage / totalValidPercentages) * totalSeats);
seatDistribution.push(seats);
});
const remainingSeats = totalSeats - seatDistribution.reduce((a, b) => a + b, 0);
const remainingParties = percentages.length - validParties.length;
const sumPercentageForOthers = 100 - validParties.reduce((a, b) => a + b, 0);
if (remainingSeats > 0 && remainingParties > 0) {
const remainingPercentage = sumPercentageForOthers - totalValidPercentages;
const seatsPerParty = Math.floor((remainingPercentage / 100) * totalSeats);
const extraSeats = remainingSeats - (seatsPerParty * remainingParties);
for (let i = 0; i < remainingParties; i++) {
const seats = seatsPerParty + (extraSeats > 0 ? 1 : 0);
seatDistribution.push(seats);
extraSeats--;
}
}
const seatSum = seatDistribution.reduce((a, b) => a + b, 0);
const seatsToAdd = totalSeats - seatSum;
// Distribute remaining seats to parties with the highest fractional parts
if (seatsToAdd > 0) {
const fractionalParts = validParties.map((percentage, index) => {
const seats = seatDistribution[index];
const fractionalPart = percentage / totalValidPercentages - seats / totalSeats;
return { index, fractionalPart };
});
fractionalParts.sort((a, b) => b.fractionalPart - a.fractionalPart);
for (let i = 0; i < seatsToAdd; i++) {
const index = fractionalParts[i % fractionalParts.length].index;
seatDistribution[index]++;
}
}
return seatDistribution;
}
// Example usage:
const percentages = [41.83, 38.10, 8.15, 5.04, 3.8];
const totalSeats = 300;
const threshold = 3;
const seatDistribution = distributeSeats(percentages, totalSeats, threshold);
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