题解 | 单组_字符串

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 first = await readline();
    const n = parseInt(first);
    const line = await readline();
    let arr = line.split('');
    const half = n >> 1;
    for (let i = 0; i < half; i++) {
        const temp = arr[i];
        arr[i] = arr[n - i - 1];
        arr[n - i - 1] = temp;
    }
    console.log(arr.join(''));
})();