main.js

var readline = require("readline");
var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false,
});

async function* getLineGen() {
  for await (const line of rl) {
    yield line;
  }
}

const getLine = async () => {
  return (await getLineGen().next()).value;
};

const getNumArr = async () =>
  (await getLine())
    .trim()
    .split(" ")
    .map((val) => parseInt(val));

const sumArr = (arr) => arr.reduce((prev, curr) => prev + curr, 0);

const main = async () => {
  const [n, t] = await getNumArr();
  const arr = await getNumArr();

  switch (t) {
    case 1:
      console.log(7);
      break;
    case 2:
      if (arr[0] > arr[1]) console.log("Bigger");
      else if (arr[0] === arr[1]) console.log("Equal");
      else console.log("Smaller");
      break;
    case 3:
      console.log(arr[1]);
      break;
    case 4:
      const sum = sumArr(arr);
      console.log(sum);
      break;
    case 5:
      const evenArr = arr.filter((val) => val % 2 == 0);
      console.log(sumArr(evenArr));
      break;
    case 6:
      const seq = arr
        .map((val) => val % 26)
        .map((val) => "a".charCodeAt(0) + val)
        .map((val) => String.fromCharCode(val))
        .join("");
      console.log(seq);
      break;
    case 7:
      let index = 0;
      const seen = new Set([0]);
      while (true) {
        index = arr[index];
        if (index < 0 || index > n - 1) {
          console.log("Out");
          break;
        }
        if (index === n - 1) {
          console.log("Done");
          break;
        }
        if (seen.has(index)) {
          console.log("Cyclic");
          break;
        }
        seen.add(index);
      }
      break;
  }
  process.exit(0);
};

main();