Follow up: Do not use any built-in library function such as sqrt. 判断一个正整数是否是完全平方数,不允许用sqr...LeetCode-367. Valid Perfect Square (Java) Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any ...
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...
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...
Binary Search, 看mid*mid == num, 若等于就是perfect square了. 若是大于就在[l, mid-1]区间找. 若是小于就在[mid+1, r]区间找. 注意overflow, 若num = Integer.MAX_VALUE, 那么mid*mid肯定overflow了. 所以mid 和 square都是long型. Time Complexity: O(logn), n =num. Space:O(1). AC Jav...
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 ...
leetcode 367[easy]---Valid Perfect Square 难度:easyGivenapositiveintegernum,writeafunctionwhichreturnsTrueifnumisaperfectsquareelseFalse.Note:Donotuseanybuilt-inlibraryfunctionsuchassqrt.Example1:Example2: 思路 leetcode-24-exercise positiveintegernum,writeafunctionwhichreturnsTrueifnumisaperfectsquareelse...
Learn how to check if a given number is a perfect number in Java with this simple guide and example code.
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: intnumSquares(intn) {while(n %4==0) n /=4;if(n %8==7)return4;for(inta=0; a*a<=n; ++a) {intb =sqrt...
guest a number from 2 to 18, keeping 1 for herself. At one point in the evening when everyone was dancing, Sally noticed the sum of each couple's numbers was a perfect square. Everyone was wearing their numbers on their clothing. The question is, what was the number of Sally's ...
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