Submission #806566

#	Time	Username	Problem	Language	Result	Execution time	Memory
806566		Valaki2	Toys (CEOI18_toy)	C++14	100 / 100	791 ms	4516 KiB

toy

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

#define pb push_back

int n;
set<int> ans;
vector<int> all;

void backtrack(int idx, int num, int sum) {
    int cur = all[idx];
    if(cur == 1) {
        if(num == 1) {
            ans.insert(sum);
        }
        return;
    }
    backtrack(idx - 1, num, sum);
    while(num % cur == 0) {
        num /= cur;
        sum += cur - 1;
        backtrack(idx - 1, num, sum);
    }
}

void solve() {
    cin >> n;
    for(int i = 1; i * i <= n; i++) {
        if(n % i == 0) {
            all.pb(i);
            if(i * i != n) {
                all.pb(n / i);
            }
        }
    }
    sort(all.begin(), all.end());
    backtrack(all.size() - 1, n, 0);
    cout << ans.size() << "\n";
    for(int cur : ans) {
        cout << cur << " ";
    }
    cout << "\n";
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

• Subtask 1: 19 / 19
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 21 / 21