제출 #844089

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
844089		Darren0724	Gift (IZhO18_nicegift)	C++17	18 / 100	2054 ms	266164 KiB

nicegift

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define x first
#define y second
const int INF = 1e18;
int32_t main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, k;
    cin >> n >> k;
    set<pair<int, int>> m;
    int total = 0;
    set<int> ele;
    for (int i = 0; i < n; i++) {
        int p;
        cin >> p;
        total += p;
        m.insert({p, i + 1});
        ele.insert(p);
    }
    if (total % k != 0) {
        cout << -1 << endl;
        return 0;
    }
    if (n == k) {
        if (ele.size() == 1) {
            cout << 1 << endl;
            cout << *ele.begin() << ' ';
            for (int i = 0; i < k; i++) {
                cout << i + 1 << ' ';
            }
            cout << endl;
            return 0;
        } else {
            cout << -1 << endl;
            return 0;
        }
    }
    vector<vector<int>> ans;
    while (m.size() > k + 1) {
        pair<int, int> d = *m.begin();
        int mn = d.x;
        m.erase(m.begin());
        vector<pair<int, int>> v;
        v.push_back(d);
        for (int i = 0; i < k - 1; i++) {
            v.push_back(*m.rbegin());
            m.erase(--m.end());
            mn = min(mn, v.back().first - 1);
        }
        mn = 1;
        vector<int> idx(k);
        for (int i = 0; i < k; i++) {
            idx[i] = v[i].y;
            v[i].x -= mn;
        }
        idx.push_back(mn);
        reverse(idx.begin(), idx.end());
        ans.push_back(idx);
        for (int i = 0; i < k; i++) {
            if (v[i].x > 0) {
                m.insert(v[i]);
            }
        }
    }
    total = 0;
    for (auto p : m) {
        total += p.x;
    }
    int need = total / k;
    vector<pair<int, int>> tmp(m.begin(), m.end());
    int sz = tmp.size();
    for (int i = 0; i < sz; i++) {
        int d = need - tmp[i].x;
        if (d < 0) {
            cout << -1 << endl;
            return 0;
        }
        if (d == 0) {
            continue;
        }
        vector<int> idx;
        for (int j = 0; j < sz; j++) {
            if (i == j)
                continue;
            idx.push_back(tmp[j].second);
        }
        idx.push_back(d);
        reverse(idx.begin(), idx.end());
        ans.push_back(idx);
    }
    cout << ans.size() << endl;
    for (auto &v : ans) {
        for (auto &j : v) {
            cout << j << ' ';
        }
        cout << endl;
    }

    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

nicegift.cpp: In function 'int32_t main()':
nicegift.cpp:41:21: warning: comparison of integer expressions of different signedness: 'std::set<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   41 |     while (m.size() > k + 1) {
      |            ~~~~~~~~~^~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 11 / 11
• Subtask 3: 0 / 12
• Subtask 4: 0 / 19
• Subtask 5: 0 / 51