結果

問題 No.2918 Divide Applicants Fairly
ユーザー けいと
提出日時 2024-10-09 00:21:24
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 3,180 bytes
コンパイル時間 2,765 ms
コンパイル使用メモリ 138,412 KB
実行使用メモリ 22,100 KB
最終ジャッジ日時 2024-10-09 00:21:35
合計ジャッジ時間 9,678 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 20 WA * 15 TLE * 1 -- * 25
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <cmath>
#include <climits>
#include <bitset>

using namespace std;

typedef long long ll;

int N;
vector<int> R;

int main() {
    cin >> N;
    R.resize(N);
    ll total_sum = 0;
    for (int i = 0; i < N; ++i) {
        cin >> R[i];
        total_sum += R[i];
    }

    ll min_diff = LLONG_MAX;

    if (N <= 20) {
        int total_N = N;
        vector<int> indices(N);
        for (int i = 0; i < N; ++i) {
            indices[i] = i;
        }

        for (int total_k = 2; total_k <= N; total_k += 2) {
            vector<vector<int>> subsets;
            vector<bool> select(N, false);
            for (int i = 0; i < total_k; ++i) {
                select[i] = true;
            }
            do {
                vector<int> subset_indices;
                for (int i = 0; i < N; ++i) {
                    if (select[i]) {
                        subset_indices.push_back(i);
                    }
                }
                subsets.push_back(subset_indices);
            } while (prev_permutation(select.begin(), select.end()));

            for (auto& subset : subsets) {
                int k = total_k / 2;
                int subset_size = subset.size();
                vector<int> subset_ratings;
                for (int idx : subset) {
                    subset_ratings.push_back(R[idx]);
                }
                int m = subset_size;
                vector<bool> team_select(m, false);
                for (int i = 0; i < k; ++i) {
                    team_select[i] = true;
                }
                ll total_selected_sum = 0;
                for (int r : subset_ratings) {
                    total_selected_sum += r;
                }
                do {
                    ll team1_sum = 0;
                    for (int i = 0; i < m; ++i) {
                        if (team_select[i]) {
                            team1_sum += subset_ratings[i];
                        }
                    }
                    ll team2_sum = total_selected_sum - team1_sum;
                    ll diff = abs(team1_sum - team2_sum);
                    if (diff < min_diff) {
                        min_diff = diff;
                    }
                } while (prev_permutation(team_select.begin(), team_select.end()));
            }
        }
    } else {
        int total_k = N;
        if (total_k % 2 != 0) {
            total_k = N - 1;
        }
        vector<pair<int, int>> rating_with_index;
        for (int i = 0; i < N; ++i) {
            rating_with_index.emplace_back(R[i], i);
        }
        sort(rating_with_index.begin(), rating_with_index.end(), greater<pair<int, int>>());

        ll team1_sum = 0;
        ll team2_sum = 0;
        for (int i = 0; i < total_k; ++i) {
            if (i % 2 == 0) {
                team1_sum += rating_with_index[i].first;
            } else {
                team2_sum += rating_with_index[i].first;
            }
        }
        ll diff = abs(team1_sum - team2_sum);
        if (diff < min_diff) {
            min_diff = diff;
        }
    }

    cout << min_diff << endl;

    return 0;
}
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