C语言 | Leetcode C语言题解之第507题完美数
题目：
题解：
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;
}