题解 | 提取不重复的整数

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
    while(line = await readline()) {
        let num = Number(line)
        const set = new Set()

        while(num > 0) {
            set.add(num % 10)
            num = parseInt(num / 10)
        }

        console.log(Array.from(set).join(''))
    }
}()