Submission #173868

#	Time	Username	Problem	Language	Result	Execution time	Memory
173868		VEGAnn	Gift (IZhO18_nicegift)	C++14	0 / 100	41 ms	10488 KiB

nicegift

#include <bits/stdc++.h>
#define sz(x) ((int)x.size())
#define pii pair<int, 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 = 100100;
set<pii, greater<pii> > st;
vector<vector<int> > ans;
vector<int> vc;
int n, k, a[N], sm;

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

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

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

    while (sm > 0){
        vc.clear();
        for (int it = 0; it < k; it++){
            pii cr = (*st.begin());
            st.erase(st.begin());
            if (cr.ft == 0)
                BAD();
            a[cr.sd]--;
            sm--;
            vc.PB(cr.sd);
        }

        ans.PB(vc);

        for (int x : vc)
            st.insert(MP(a[x], x));

    }

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

    return 0;
}

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