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class Solution {

public:

bool checkPerfectNumber(int num) {

if(num == 1) return 0;

int sum = 0;

sum += 1;

for(int i = 2; i <= sqrt(num); i++) {

if(num % i == 0) {

sum += i;

sum += num / i;

}

}

return num == sum;

}

};