[JavaScript/Queue] 백준 실버 4 : 2164 - 카드 2

https://www.acmicpc.net/problem/2164

2164번: 카드2

 

📌 작성한 코드 

// 2164
const fs = require("fs");
const filePath = process.platform === "linux" ? "/dev/stdin" : "Beakjoon/Silver/test.txt";
let input = fs.readFileSync(filePath).toString().trim().split("\n");

class Node {
    constructor(val) {
        this.value = val;
        this.next = null;
    }
}

class Queue {
    constructor() {
        this.first = null;
        this.last = null;
        this.size = 0;
    }
    push(val) {
        let newNode = new Node(val);
        if (!this.first) {
            this.first = newNode;
            this.last = newNode;
        } else {
            this.last.next = newNode;
            this.last = newNode;
        }
        return ++this.size;
    }
    pop() {
        if (!this.first) return null;
        let temp = this.first;
        if (this.first === this.last) {
            this.last = null;
        }
        this.first = this.first.next;
        this.size--;
        return temp.value;
    }
}

const N = Number(input[0]);
const queue = new Queue();
for (let i = 1; i <= N; i++) {
    queue.push(i);
}

while (queue.size !== 1) {
    queue.pop();
    queue.push(queue.pop());
}

console.log(queue.pop());

 

✅ 성공