Submission #591687

#	Time	Username	Problem	Language	Result	Execution time	Memory
591687		AlperenT	Detecting Molecules (IOI16_molecules)	C++17	69 / 100	82 ms	12780 KiB

molecules

#include <bits/stdc++.h>
#include "molecules.h"

using namespace std;

vector<int> find_subset(int l, int u, vector<int> w){
    int n = w.size(), sum = 0;

    set<pair<int, int>> taken, free;

    vector<pair<int, int>> arr;

    for(int i = 0; i < n; i++) arr.push_back({w[i], i});

    sort(arr.begin(), arr.end());

    for(int i = 0; i < n; i++){
        if(sum < l){
            sum += arr[i].first;
            taken.insert(arr[i]);
        }
        else{
            free.insert(arr[i]);
        }
    }

    bool flag = false;

    while(!(sum >= l && sum <= u)){
        if(sum > u){
            if(flag) return vector<int>{};

            if(free.empty() || free.begin()->first - prev(taken.end())->first >= 0){
                sum -= prev(taken.end())->first;
                free.insert(*prev(taken.end()));
                taken.erase(prev(taken.end()));
            }
            else{
                sum += free.begin()->first - prev(taken.end())->first;

                pair<int, int> p = *free.begin(), p2 = *prev(taken.end());

                free.erase(p), taken.erase(p2);
                free.insert(p2), taken.insert(p);
            }
        }
        else if(sum < l){
            if(free.empty() || prev(free.end())->first - taken.begin()->first <= 0){
                return vector<int>{};
            }
            else{
                flag = true;

                sum += prev(free.end())->first - taken.begin()->first;

                pair<int, int> p = *prev(free.end()), p2 = *taken.begin();

                free.erase(p), taken.erase(p2);
                free.insert(p2), taken.insert(p);
            }
        }
    }

    vector<int> ans;

    for(auto p : taken) ans.push_back(p.second);

    long long actsum = 0;
    
    for(auto i : ans) actsum += w[i];

    assert(actsum >= l && actsum <= u);

    return ans;
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 15 / 15
• Subtask 5: 23 / 23
• Subtask 6: 0 / 31