题解 | #字符统计#

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

void async function () {
    let line = await readline()
    let numMap = {}
    for (let i of line) {
        if (numMap[i]) {
            numMap[i] ++
        } else {
            numMap[i] = 1
        }
    }
    let resArr = Object.keys(numMap)
    resArr.sort((a, b) => {
        if (numMap[b] === numMap[a]) {
            return a.charCodeAt() - b.charCodeAt()
        } else {
            return numMap[b] - numMap[a]
        }
    })
    console.log(resArr.join(''))
}()