五、完善程序-1

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#include <bits/stdc++.h>
using namespace std;

int main(){
    int n;
    cin >> n;

    vector<int> fac;
    fac.reserve((int)ceil(sqrt(n)));

    int i;
    for (i = 1; i * i < n; ++i){
        if (①){
            fac.push_back(i);
        }
    }

    for (int k = 0; k < fac.size(); ++k){
        cout << ② << "";
    }
    if (③) {
        cout << ④ << "";
    }
    for (int k = fac.size() - 1; k >= 0; --k){
        cout << ⑤ << "";
    }
}