Submission #683495

#	Time	Username	Problem	Language	Result	Execution time	Memory
683495		opPO	Gift (IZhO18_nicegift)	C++17	30 / 100	2082 ms	234944 KiB

nicegift

#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>

using namespace std;

#define int long long
#define f first
#define s second
#define pb push_back
#define ld long double
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define vec vector

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

mt19937_64 gen(chrono::steady_clock::now().time_since_epoch().count());
const ld eps = 1e-6;
const int mod = 998244353;
const int oo = 2e9;
const ll OO = 2e18;
const int N = 1e5 + 10;

bool cmp(pii a, pii b)
{
    return a > b;
}

void solve()
{
    int n, k;
    cin >> n >> k;
    vec<int> a(n + 1);
    set<pii, decltype(cmp)*> setik(cmp);
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        setik.insert({a[i], i});
    }
    vec<vec<int>> operations;
    while (sz(setik) >= k)
    {
        vec<int> op = {1};
        vec<pii> q;
        for (int i = 0; i < k; i++)
        {
            pii cur = *setik.begin(); setik.erase(setik.begin());
            op.pb(cur.s);
            cur.f--;
            q.pb(cur);
        }
        for (int i = 0; i < k; i++) if (q[i].f != 0) setik.insert(q[i]);
        operations.pb(op);
    }
    if (sz(setik) != 0)
    {
        cout << -1;
        return;
    }
    cout << sz(operations) << "\n";
    for (auto &operation : operations)
    {
        for (auto &x : operation) cout << x << " ";
        cout << "\n";
    }
}

int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    solve();
    return 0;
}

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