Submission #90919

#	Time	Username	Problem	Language	Result	Execution time	Memory
90919		toloraia	Gift (IZhO18_nicegift)	C++17	30 / 100	97 ms	32400 KiB

nicegift

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define F first
#define S second

using namespace std;

const int N = 5e5 + 5, INF = 1e9 + 5;

int n, k;
pair < int, int > P[N];
int nn;
vector < int > V[N], v;
int S;

int main()
{
    ios::sync_with_stdio(false);
    cin>>n>>k;
    for (int i = 1; i <= n; i++){
        cin>>P[i].F;
        P[i].S = i;
        S += P[i].F;
    }
    sort (P + 1, P + n + 1);
    reverse (P + 1, P + n + 1);
    if (S <= 1e5){
        while (P[k].F > 0){
            int I1 = k, I2 = k;
            for (int i = 20; i >= 0; i--){
                if (I1 - (1<<i) <= 0)
                    continue;
                if (P[I1 - (1<<i)].F == P[k].F)
                    I1 -= (1<<i);
            }
            for (int i = 20; i >= 0; i--){
                if (I2 + (1<<i) > n)
                    continue;
                if (P[I2 + (1<<i)].F == P[k].F)
                    I2 += (1<<i);
            }
            v.clear();
            for (int i = 1; i < I1; i++){
                v.pb (P[i].S);
                P[i].F--;
            }
            for (int i = I2; (int)v.size() < k; i--){
                v.pb (P[i].S);
                P[i].F--;
            }
            V[++nn] = v;
        }
        if (P[1].F > 0){
            cout<<-1<<endl;
            return 0;
        }
        cout<<nn<<endl;
        for (int i = 1; i <= nn; i++){
            cout<<"1 ";
            for (int j = 0; j < k; j++)
                cout<<V[i][j]<<" ";
            cout<<endl;
        }
        return 0;
    }
    return 0;
}

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