3 つのキュー (paizaランク C 相当)
解答例

問題文に沿って実装します。
const fs = require("fs");
const input = fs.readFileSync("/dev/stdin", "utf-8").trim();
const lines = input.split("\n");

const [N] = lines[0].split(" ").map(Number);

let [queue1, queue2, queue3] = [[], [], []];

for (let i = 1; i <= N; i++) {
  const Q = lines[i].split(" ").map((v, i) => i === 0 ? v : Number(v));
  if (Q[0] === "push") {
    const [_, S, X] = Q;
      if (S === 1) {
        queue1.push(X);
      } else if (S === 2) {
        queue2.push(X);
      } else {
        queue3.push(X);
      }
  } else {
    const [_, S] = Q;
      if (S === 1) {
        queue1.shift();
      } else if (S === 2) {
        queue2.shift();
      } else {
        queue3.shift();
      }
  }
}
if(queue1.length > 0) console.log(queue1.join("\n"));
if(queue2.length > 0) console.log(queue2.join("\n"));
if(queue3.length > 0) console.log(queue3.join("\n"));