题解 | #求解立方根#

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
    let num;
    while ((line = await readline())) {
        num = +line;
    }
    let left;
    let right;
    let result;
    let half;
    const t=0.01;
    if (num == 1) {
        result = 1;
    } else if (num == -1) {
        result = -1;
    } else if (num == 0) {
        result = 0;
    } else if (num > -1 && num < 1) {
        if (num > 0) {
            left = 0;
            right = 1;
            half = (left + right) / 2;
            // console.log(half)
            while (Math.abs(half ** 3 - num) > t) {
                if (half ** 3 < num) {
                    left = half;
                    half = (left + right) / 2;
                } else {
                    right = half;
                    half = (left + right) / 2;
                }
            }
            result = half;
        } else {
            left = -1;
            right = 0;
            half = (left + right) / 2;
            while (Math.abs(half ** 3 - num) > t) {
                if (half ** 3 < num) {
                    left = half;
                    half = (left + right) / 2;
                } else {
                    right = half;
                    half = (left + right) / 2;
                }
            }
            result = half;
        }
    } else if (num > 1 || num < -1) {
        if (num > 1) {
            left = 1;
            right = num;
            half = (left + right) / 2;
            while (Math.abs(half ** 3 - num) > t) {
                if (half ** 3 < num) {
                    left = half;
                    half = (left + right) / 2;
                } else {
                    right = half;
                    half = (left + right) / 2;
                }
            }
            result = half;
        } else {
            left = num;
            right = -1;
            half = (left + right) / 2;
            while (Math.abs(half ** 3 - num) > t) {
                if (half ** 3 < num) {
                    left = half;
                    half = (left + right) / 2;
                } else {
                    right = half;
                    half = (left + right) / 2;
                }
            }
            result = half;
        }
    }
    console.log(result.toFixed(1));
})();