Submission #173909

#	Time	Username	Problem	Language	Result	Execution time	Memory
173909		VEGAnn	Gift (IZhO18_nicegift)	C++14	49 / 100	416 ms	49600 KiB

nicegift

#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define pii pair<int, int>
#define pli pair<ll, int>
#define ft first
#define sd second
#define MP make_pair
#define PB push_back
using namespace std;
typedef long long ll;
const int oo = 2e9;
const ll OO = 1e18;
const int N = 1000100;
set<pli, greater<pli> > st;
vector<vector<ll> > ans;
vector<ll> vc;
int n, k;
ll a[N];

void BAD(){
    cout << -1;
    exit(0);
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);

    cin >> n >> k;
    bool ok = 1;
    for (int i = 0; i < n; i++){
        cin >> a[i];
        if (i > 0)
            ok &= bool(a[i] == a[i - 1]);
    }

    if (ok){
        int kl = k / __gcd(n, k);
        if (a[0] % kl == 0){
            int bd = kl * n;
            for (int it = 0; it < bd; it += k){
                vc.clear();
                for (int lit = 0; lit < k; lit++){
                    int ps = (it + lit) % n;
                    vc.PB(ps);
                }
                ans.PB(vc);
            }

            cout << sz(ans) << '\n';
            for (int it = 0; it < sz(ans); it++){
                cout << a[0] / kl;
                for (ll x : ans[it])
                    cout << " " << x + 1;
                cout << '\n';
            }
        } else {
            cout << -1;
        }

        return 0;
    }

    for (int i = 0; i < n; i++){
        st.insert(MP(a[i], i));
    }

    for (ll po = 59; po >= 0; po--){

        ll cur = (1ll << po);

        while ((*st.begin()).ft > 0){
            vc.clear();
            vc.PB(cur);
            bool was = 0;
            for (int it = 0; it < k; it++){
                pli cr = (*st.begin());
                st.erase(st.begin());
                if (cr.ft < cur) {
                    vc.PB(cr.sd);
                    was = 1;
                    break;
                }
                a[cr.sd] -= cur;
                vc.PB(cr.sd);
            }

            if (was) {
                for (int it = 1; it < sz(vc); it++){
                    int x = vc[it];
                    if (it < sz(vc) - 1)
                        a[x] += cur;
                    st.insert(MP(a[x], x));
                }
                break;
            } else {
                ans.PB(vc);
                for (int it = 1; it < sz(vc); it++){
                    int x = vc[it];
                    st.insert(MP(a[x], x));
                }
            }

        }

    }

    if ((*st.begin()).ft > 0)
        BAD();

    cout << sz(ans) << '\n';
    for (int it = 0; it < sz(ans); it++){
//        cout << "1";
        for (int i = 0; i < sz(ans[it]); i++){
            if (i == 0)
                cout << ans[it][0];
            else cout << " " << ans[it][i] + 1;
        }
        cout << '\n';
    }

    return 0;
}

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