const { readInput, sum } = require("./util");

const { paragraphs } = readInput();

function intersect(strA, strB) {
  const setB = new Set(strB);
  return strA
    .split("")
    .filter((el) => setB.has(el))
    .join("");
}
function intersections(...strings) {
  let res = strings[0];
  for (const cur of strings.slice(1)) {
    res = intersect(res, cur);
  }
  return res;
}

console.log("Part1:");
console.log(sum(paragraphs.map((p) => new Set(p.replaceAll("\n", "")).size)));
console.log("Part2:");
console.log(sum(paragraphs.map((p) => intersections(...p.split("\n")).length)));