题解 | #自动售货系统#

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
    // Write your code here
    const categories = ["A1", "A2", "A3", "A4", "A5", "A6"];
    let commodities;
    const changes = ["1", "2", "5", "10"];
    let moneyBox = [];
    let balance = 0;

    const isNullCommodities = () => {
        for (let categroy of categories) {
            if (commodities.get(categroy).number !== 0) return false;
        }
        return true;
    };

    const initial = (tokens) => {
        let commoditiesNumber = tokens[1].split("-").map(Number);
        commodities = new Map([
            ["A1", { price: 2, number: commoditiesNumber[0] }],
            ["A2", { price: 3, number: commoditiesNumber[1] }],
            ["A3", { price: 4, number: commoditiesNumber[2] }],
            ["A4", { price: 5, number: commoditiesNumber[3] }],
            ["A5", { price: 8, number: commoditiesNumber[4] }],
            ["A6", { price: 6, number: commoditiesNumber[5] }],
        ]);
        moneyBox = tokens[2].split("-").map(Number);
        console.log("S001:Initialization is successful");
    };

    const pay = (temp) => {
        if (!changes.includes(temp)) console.log("E002:Denomination error");
        else if (
            (temp === "5" || temp === "10") &&
            (moneyBox.length === 0 ||
                moneyBox[0] + moneyBox[1] * 2 < parseInt(temp))
        )
            console.log("E003:Change is not enough, pay fail");
        else if (isNullCommodities())
            console.log("E005:All the goods sold out");
        else {
            balance += parseInt(temp);
            switch (temp) {
                case "1":
                    moneyBox[0]++;
                    break;
                case "2":
                    moneyBox[1]++;
                    break;
                case "5":
                    moneyBox[2]++;
                    break;
                case "10":
                    moneyBox[3]++;
                    break;
            }
            console.log(`S002:Pay success,balance=${balance}`);
        }
    };

    const buy = (temp) => {
        if (!categories.includes(temp))
            console.log("E006:Goods does not exist");
        else if (commodities.get(temp).number === 0)
            console.log("E007:The goods sold out");
        else if (balance < commodities.get(temp).price)
            console.log("E008:Lack of balance");
        else {
            balance -= commodities.get(temp).price;
            console.log(`S003:Buy success,balance=${balance}`);
        }
    };

    const refuse = () => {
        if (balance === 0) {
            console.log("E009:Work failure");
        } else {
            let dp = new Array(4).fill(0);
            for (let i = 3; i >= 0; i--) {
                let change = changes[i];
                while (balance >= change && moneyBox[i] > 0) {
                    balance -= change;
                    moneyBox[i]--;
                    dp[i]++;
                }
            }
            for (let i = 0; i < 4; i++) {
                console.log(changes[i].concat(" yuan coin number=", dp[i]));
            }
        }
    };

    const query = (temp) => {
        if (temp === "0") {
            for (let i = 0; i < 6; i++) {
                let str = categories[i].concat(
                    " ",
                    commodities.get(categories[i]).price,
                    " ",
                    commodities.get(categories[i]).number
                );
                console.log(str);
            }
        } else if (temp === "1") {
            for (let i = 0; i < 4; i++) {
                let str = changes[i].concat(" yuan coin number=", moneyBox[i]);
                console.log(str);
            }
        } else console.log("E010:Parameter error");
    };

    while ((line = await readline())) {
        let options = line.split(";");
        for (let option of options) {
            let tokens = option.split(" ");
            switch (tokens[0]) {
                case "r":
                    initial(tokens);
                    break;
                case "p":
                    pay(tokens[1]);
                    break;
                case "b":
                    buy(tokens[1]);
                    break;
                case "c":
                    refuse();
                    break;
                case "q":
                    query(tokens[1]);
                    break;
                default:
                    if (tokens[0][0] === "q") {
                        console.log("E010:Parameter error");
                    }
                    break;
            }
        }
    }
})();