利用二分搜索法求给定数立方根的 Java 程序

原文:https://www . geesforgeks . org/Java-program-to-find-给定数字的立方根-使用二进制搜索/

给定一个非负数，使用二分搜索法方法求一个数的立方根。

例:

Input: x = 27
Output: 3
Explanation:  The cube root of 16 is 4.

Input: x = 120
Output: 4
Explanation:  The cube root of 120 lies in between
4 and 5 so floor of the cube root is 4.

天真方法:

  • Check the cube of each element until n, and store the answer until the cube is less than or equal to n.

Java

// Java Program to Find the cube root
// of given number using Naive approach
import java.io.*;
class GFG {
    static int cuberoot(int n)
    {
        int ans = 0;

        for (int i = 1; i <= n; ++i) {
            // checking every number cube
            if (i * i * i <= n) {
                ans = i;
            }
        }
        return ans;
    }
    public static void main(String[] args)
    {
        // Number
        int number = 27;
        // Checking number
        int cuberoot = cuberoot(number);
        System.out.println(cuberoot);
    }
}

输出

3

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