C++ | Leetcode C++题解之第507题完美数

题目：

题解：

class Solution {
public:bool checkPerfectNumber(int num) {if (num == 1) {return false;}int sum = 1;for (int d = 2; d * d <= num; ++d) {if (num % d == 0) {sum += d;if (d * d < num) {sum += num / d;}}}return sum == num;}
};