Submission #944239

#	Time	Username	Problem	Language	Result	Execution time	Memory
944239		phoenix0423	Toys (CEOI18_toy)	C++17	100 / 100	956 ms	6048 KiB

toy

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
#define fastio ios::sync_with_stdio(false), cin.tie(0)
#pragma GCC optimize("Ofast")
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define int long long
const int maxn = 2e5 + 5;

vector<int> factorize(int n){
    vector<int> p;
    for(int i = 1; i <= sqrt(n); i++){
        if(n % i == 0){
            if(i != 1) p.pb(i);
            if(i != n / i) p.pb(n / i);
        }
    }
    sort(p.begin(), p.end());
    return p;
}

signed main(void){
    fastio;
    int n;
    cin>>n;
    vector<int> p = factorize(n);
    vector<vector<int>> mp;
    for(auto x : p) mp.pb(factorize(x));
    set<int> ans;
    auto dfs = [&](auto dfs, int cur, int lst, int cnt) -> void{
        if(cur == n){
            ans.insert(cnt);
            return;
        }
        auto id = lower_bound(p.begin(), p.end(), n / cur) - p.begin();
        int st = lower_bound(mp[id].begin(), mp[id].end(), lst) - mp[id].begin();
        for(int i = st; i < mp[id].size(); i++){
            dfs(dfs, cur * mp[id][i], mp[id][i], cnt + mp[id][i] - 1);
        }
    };
    dfs(dfs, 1, 1, 0);
    cout<<ans.size()<<"\n";
    for(auto x : ans) cout<<x<<" ";
    cout<<"\n";
}

Compilation message (stderr)

toy.cpp: In instantiation of 'main()::<lambda(auto:23, long long int, long long int, long long int)> [with auto:23 = main()::<lambda(auto:23, long long int, long long int, long long int)>]':
toy.cpp:45:21:   required from here
toy.cpp:41:27: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         for(int i = st; i < mp[id].size(); i++){
      |                         ~~^~~~~~~~~~~~~~~

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