Submission #536879

#	Time	Username	Problem	Language	Result	Execution time	Memory
536879		chicken337	Toys (CEOI18_toy)	C++14	79 / 100	5060 ms	39436 KiB

toy

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

set<pair<int, int>> vis;

void backtrack(int n, int sum){
    if(vis.find({n, sum}) != vis.end())
        return;
    vis.insert({n, sum});
    for(int k = 2; k <= sqrt(n); k ++){
        int div = n / k;
        if((div * k) == n)
            backtrack(div, sum + k - 1),
            backtrack(k, sum + div - 1);
    }
    if(n != 1)
        backtrack(1, sum + n - 1);
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n; cin >> n;
    backtrack(n, 0);

    set<int> unique;
    for(auto &[num, sum] : vis)
        if(num == 1)
            unique.insert(sum);
    cout << unique.size() << '\n';
    for(int it : unique)
        cout << it << ' ';
}

Compilation message (stderr)

toy.cpp: In function 'int main()':
toy.cpp:28:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   28 |     for(auto &[num, sum] : vis)
      |               ^

• Subtask 1: 19 / 19
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 21