题解 | #提取不重复的整数#

const readline = require("readline");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});
rl.on("line", function (line) {
    let arr = line.split("");
    let len = arr.length;
    let str='';
    for (let i = len - 1; i >= 0; i--) {
        if (str.length >= 1) {
            for (let j = 0; j < str.length; j++) {
                if (arr[i] == str[j]) {
                    arr[i] = "";
                }
            }
        }
        str += arr[i];
    }
    console.log(str);
});