const fs = require("fs");

function parseInputAndCalculateSimilarity(filePath) {
  const fileContent = fs.readFileSync(filePath, "utf-8");

  const leftList = [];
  const rightList = [];
  fileContent.split("\n").forEach((line) => {
    if (line.trim() !== "") {
      const [left, right] = line.split(/\s+/).map(Number);
      leftList.push(left);
      rightList.push(right);
    }
  });

  function calculateSimilarityScore(left, right) {
    const rightCountMap = {};
    right.forEach((num) => {
      rightCountMap[num] = (rightCountMap[num] || 0) + 1;
    });

    let similarityScore = 0;
    left.forEach((num) => {
      if (rightCountMap[num]) {
        similarityScore += num * rightCountMap[num];
      }
    });

    return similarityScore;
  }

  return calculateSimilarityScore(leftList, rightList);
}

const filePath = "inputs/1";
const similarityScore = parseInputAndCalculateSimilarity(filePath);

console.log(similarityScore);