题解 | 完全数计算

#include <iostream>
#include <vector>
using namespace std;

int main(){
    int n;
    cin>>n;
    vector<int> res;
    if(n == 1){
        cout<<0<<endl;
    }
    int count = 0;
    while (n > 1)
    {
        for (int i = 1; i < n; ++i)
        {
            if (n % i == 0)
            {
                res.push_back(i);
            }
        }
        int sum = 0;
        for (auto &value : res)
        {
            sum += value;
        }
        if(sum == n){
            count++;
        }
        n--;
        res.clear();
    }
    cout<<count<<endl;
}