改成这样： 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 str = await readline(); const inarr = str.split(""); const arr = []; for (let i = 0, l = inarr.length; i < l; i++) { const item = inarr[i]; if (i > 0 &;&; item === arr[arr.length - 1]) { arr.pop(); } else { arr.push(item); } } if (arr.length > 0) { console.log(arr.join("")); } else { console.log(0); } })();