02 第一种解法 暴力解法,定义一个long类型的变量,for循环判断其平方是否小于num,但是不要写循环体,这样省时,最后直接判断其平方是否等于num。 public boolean isPerfectSquare(intnum) {if(num<=1) {returnnum==1; } long i =1;for( ; i*i <num; i++);returni*i ==num; } 03 第二种解法 使用...
public final static boolean isPerfectSquare(long n) { if (n < 0) return false; long tst = (long)(Math.sqrt(n) + 0.5); return tst*tst == n; } Run Code Online (Sandbox Code Playgroud) 注意:我在许多Project Euler问题中使用此函数.因此,没有其他人必须维护此代码.而这种微优化实际上...
Non-Perfect Square Example:In the second example, 20 is not a perfect square because 20≈4.47\sqrt{20} \approx 4.4720≈4.47, which is not an integer. Conclusion This Java program is a simple way to determine whether a number is a perfect square or not. By using the Math.sqrt() m...
四平方和定理(Lagrange's Four-Square Theorem):所有自然数至多只要用四个数的平方和就可以表示。 参考链接:https://leetcode.com/discuss/56982/o-sqrt-n-in-ruby-and-c C代码: int numSquares(int n) { while (n % 4 == 0) n /= 4; if (n % 8 == 7) return 4; for (int a=0; a*a...
Write a Java program to test if a given number (positive integer) is a perfect square or not. Input number: 3 Output: 1 2 3 8 9 4 7 6 5 Visual Presentation:Sample Solution:Java Code:// Import Scanner class from java.util package for user input import java.util.*; // Main ...
defisPerfectSquare(self, num): """ :type num: int :rtype: bool """ x=int(round(math.exp(math.log(num)/2))) returnx*x==num 注意,int(round(xxx))是经典写法,记住! 另外的解法:A square number is 1+3+5+7+..., JAVA code,不知道这个是否数学证明过。。。
LeetCode 367 Valid Perfect Square 有效的完全平方 C语言 Valid Perfect Square Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any built-in library function such as sqrt. 实现函数功能:检测输入的正......
publicclassSolution{/** * @param n: a positive integer * @return: An integer */publicintnumSquares(intn) {// write your code hereint[] f = newint[n +1];for(inti =0; i <= n; i++) { f[i] = i;// max square number is i itself with all 1for(intj =1; j * j <= ...
Each rectangle is represented as a bottom-left point and a top-right point. For example, a unit square is represented as [1,1,2,2]. (coordinate of bottom-left point is (1, 1) and top-right point is (2, 2)). Example 1: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 rectangl...
Given a positive integern, find the least number of perfect square numbers (for example,1, 4, 9, 16, ...) which sum ton. Example 1: Input:n=12Output: 3 Explanation:12 = 4 + 4 + 4. 1. 1. Example 2: Input:n=13Output: 2 ...