当然,你要是把int范围内的5个Perfect Number(第5个是33550336)都找出来了,直接做判断也行。 publicbooleancheckPerfectNumber3(intnum){int[] primes = {2,3,5,7,13};for(intp: primes) {if((1<< (p -1)) * ((1<< p) -1) == num) {returntrue; } }returnfalse; } 05 小结 算法专题目前...
Time Complexity: O(Math.sqrt(num)). Space: O(1). AC Java: 1publicclassSolution {2publicbooleancheckPerfectNumber(intnum) {3if(num == 1){4returnfalse;5}67intsum = 1;8for(inti = 2; i<Math.sqrt(num); i++){9if(num%i == 0){10sum += i+num/i;11}12}13returnsum ==num;14...
去LintCode 对题目进行在线测评 全部(3)cpp(1)python3(1)java(1) 只看精选 九章算法助教团队精选 更新于 6/9/2020, 7:04:17 PM cpp class Solution { public: /** * @param num: an integer * @return: returns true when it is a perfect number and false when it is not */ bool check...
4. If the sum is equal to the number, print “The number is a perfect number”. 5. If the sum is not equal to the number, print “The number is not a perfect number”. Program/Source Code Here is the source code of the Java Program to Check if a given Number is Perfect Number...
In this JavaScript code, we are going to check whether a given number is perfect number or not.
System.out.println("It is Perfect Number"); elseSystem.out.println("It is not Perfect Number"); } } Output It is Perfect Number Recursive approach We can use recursion technique, if don’t want to use while loop. It reduces code statements but provides the accurate result. ...
According to number theory, a limb of pure mathematics that deals with integers, a Perfect Number can be defined as a positive integer whose value is
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Code Issues Pull requests A function for encoding unique ordered sets of natural numbers into a single unique natural number. algorithm mathematical-functions perfect-hash cantor pairing-functions minimal-perfect-hash szudzik perfect-hash-functions Updated Aug 1, 2022 andre...
public boolean checkPerfectNumber(int num) { if (num == 1) { return false; } int sum = 1, sqrt = (int)Math.sqrt(num); for (int i = 2; i <= sqrt; i ++) { if (num % i == 0) { sum += i + (i * i == num? 0: num / i); ...