题解 | #求解立方根#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});

rl.on('line', function (line) {
    // 不能使用库函数
    // const num = Number(line)
    // const abs = Math.pow(Math.abs(num), 1/3).toFixed(1)
    // console.log(num > 0? abs : '-' + abs);


    const num = Number(line)
    let res = 0
    let min = 100
    
    for(let i = 0; i < Math.ceil(Math.abs(num) / 3); i += 0.1){
        // 差值最小即为所求
        const tmp = Math.abs(Math.pow(i, 3) - Math.abs(num))
        if(tmp < min){
            res = i
            min = tmp
        }
    }

    console.log(num > 0? res.toFixed(1): '-' + res.toFixed(1))
});