oj.uz

Submission #171303

# Submission time Handle Problem Language Result Execution time Memory
171303 2019-12-28T09:51:34 Z emil_physmath Gift (IZhO18_nicegift) C++17
30 / 100
 2000 ms 177724 KB 
#include <algorithm>
#include <iostream>
#include <vector>
#include <queue>
#include <cmath>
#include <map>
#include <set>
using namespace std;
typedef double ldouble;
typedef long long llong;
const int maxN = 100001;

int n, k;
vector<llong> arr;
multiset<pair<llong, int>> a;
llong mx = -1, sum = 0;
vector<pair<llong, vector<int>>> ans;

void Subtract(multiset<pair<llong, int>>::reverse_iterator s)
{
    //cerr << "1\n";
    auto st_s = s;
    vector<int> cur;
    llong mn = s->first;
    auto it = s;
    for (; cur.size() < k; ++it)
    {
        cur.push_back(it->second);
        mn = min(mn, it->first);
    }
    int st_mn = mn;
    if (it != a.rend())
        mn = min(mn, sum / k - it->first);
    if (st_s != a.rbegin())
        mn = min(mn, sum / k - a.rbegin()->first);
    if (!mn)
        return;
    if (st_mn < mn)
    {
        auto st_it = it;
        bool itIsEnd = false;
        for (int x = 0; x < k; ++x)
        {
            if (it == a.rend())
            {
                itIsEnd = true;
                break;
            }
            ++it;
        }
        if (!itIsEnd)
        {
            Subtract(st_it);
            return;
        }
    }
    // sum / k - it->first < mn
    // sum / k < mn + it->first
    // sum / k < 2 * it->first
    // sum < k * it->first * 2
    // sum > k * it->first
    if (!mn) throw;
    // it->first <= (sum - k * mn) / k
    // k * it->first <= sum - k * mn
    // mn * k <= sum - k * it->first
    // mn <= sum / k - it->first
    /*
        mn = min(mn, a.rbegin()->first - it->first + 1);
    */
    /*
    if (!mn)
    {
        cout << -1 << endl;
        exit(0);
    }
    */
    for (int x: cur)
    {
        a.erase({arr[x], x});
        sum -= arr[x];
        a.insert({arr[x] -= mn, x});
        sum += arr[x];
    }
    ans.push_back({mn, cur});
    /*cerr << "a` ";
    for (pair<llong, int> i: a)
        cerr << i.first << ' ';
    cerr << endl;*/
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    cin >> n >> k;
    arr.resize(n);
    for (int i = 0; i < n; ++i)
    {
        cin >> arr[i];
        sum += arr[i];
        mx = max(mx, arr[i]);
        a.insert({arr[i], i});
    }
    if (sum % k || mx > sum / k)
    {
        cout << -1 << endl;
        exit(0);
    }

    while (a.rbegin()->first)
    {
        //cerr << "0\n";
        Subtract(a.rbegin());
        /*cerr << endl << ":";
        for (auto it: a)
            cerr << it.first << ' ';
        cerr << ":" << endl;*/
    }
    cout << ans.size() << '\n';
    for (auto x: ans)
    {
        cout << x.first << ' ';
        for (int y: x.second)
            cout << y + 1 << ' ';
        cout << '\n';
    }
}
// 6 5 4 3 x
// x x-1 x-2 x-3 x

Compilation message

nicegift.cpp: In function 'void Subtract(std::multiset<std::pair<long long int, int> >::reverse_iterator)':
nicegift.cpp:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (; cur.size() < k; ++it)
            ~~~~~~~~~~~^~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB n=4
2 Correct 7 ms 376 KB n=3
3 Correct 2 ms 376 KB n=3
4 Correct 2 ms 504 KB n=4
5 Correct 2 ms 376 KB n=4
6 Correct 2 ms 376 KB n=2

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB n=4
2 Correct 7 ms 376 KB n=3
3 Correct 2 ms 376 KB n=3
4 Correct 2 ms 504 KB n=4
5 Correct 2 ms 376 KB n=4
6 Correct 2 ms 376 KB n=2
7 Correct 2 ms 376 KB n=5
8 Correct 1 ms 376 KB n=8
9 Correct 2 ms 376 KB n=14
10 Correct 5 ms 248 KB n=11
11 Correct 59 ms 6456 KB n=50000
12 Correct 42 ms 6068 KB n=50000
13 Correct 2 ms 376 KB n=10
14 Correct 3 ms 504 KB n=685
15 Correct 1 ms 376 KB n=623
16 Correct 3 ms 504 KB n=973

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB n=4
2 Correct 7 ms 376 KB n=3
3 Correct 2 ms 376 KB n=3
4 Correct 2 ms 504 KB n=4
5 Correct 2 ms 376 KB n=4
6 Correct 2 ms 376 KB n=2
7 Correct 2 ms 376 KB n=5
8 Correct 1 ms 376 KB n=8
9 Correct 2 ms 376 KB n=14
10 Correct 5 ms 248 KB n=11
11 Correct 59 ms 6456 KB n=50000
12 Correct 42 ms 6068 KB n=50000
13 Correct 2 ms 376 KB n=10
14 Correct 3 ms 504 KB n=685
15 Correct 1 ms 376 KB n=623
16 Correct 3 ms 504 KB n=973
17 Correct 2 ms 504 KB n=989
18 Correct 3 ms 376 KB n=563
19 Correct 1 ms 376 KB n=592
20 Correct 3 ms 376 KB n=938
21 Correct 4 ms 376 KB n=747
22 Correct 3 ms 504 KB n=991

Subtask #4
0 / 19.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2041 ms 177724 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 51.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB n=4
2 Correct 7 ms 376 KB n=3
3 Correct 2 ms 376 KB n=3
4 Correct 2 ms 504 KB n=4
5 Correct 2 ms 376 KB n=4
6 Correct 2 ms 376 KB n=2
7 Correct 2 ms 376 KB n=5
8 Correct 1 ms 376 KB n=8
9 Correct 2 ms 376 KB n=14
10 Correct 5 ms 248 KB n=11
11 Correct 59 ms 6456 KB n=50000
12 Correct 42 ms 6068 KB n=50000
13 Correct 2 ms 376 KB n=10
14 Correct 3 ms 504 KB n=685
15 Correct 1 ms 376 KB n=623
16 Correct 3 ms 504 KB n=973
17 Correct 2 ms 504 KB n=989
18 Correct 3 ms 376 KB n=563
19 Correct 1 ms 376 KB n=592
20 Correct 3 ms 376 KB n=938
21 Correct 4 ms 376 KB n=747
22 Correct 3 ms 504 KB n=991
23 Execution timed out 2041 ms 177724 KB Time limit exceeded
24 Halted 0 ms 0 KB -