题解 | 取近似值

const readline = require("readline");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});
rl.on("line", function (line) {
    const arr = line.split(".");
    if (arr.length === 1) {
        process.stdout.write(arr[0]);
        return;
    }
    const [n, [m]] = arr;
    process.stdout.write("" + (+m >= 5 ? +n + 1 : +n));
});