Submission #860854

#	Time	Username	Problem	Language	Result	Execution time	Memory
860854		alexdd	Gift (IZhO18_nicegift)	C++17	30 / 100	2078 ms	388076 KiB

nicegift

#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,k;
int a[1000005];
priority_queue<pair<int,int>> pq;
vector<vector<int>> af;
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>k;
    int sum=0;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        sum += a[i];
        pq.push({a[i],i});
    }
    if(sum%k!=0)
    {
        cout<<-1;
        return 0;
    }
    while(!pq.empty())
    {
        if((int)pq.size()<k)
        {
            cout<<-1;
            return 0;
        }
        vector<int> sc;
        //cout<<1<<" ";
        for(int i=0;i<k;i++)
        {
            sc.push_back(pq.top().second);
            a[sc.back()]--;
            //cout<<sc.back()<<" ";
            pq.pop();
        }
        //cout<<"\n";
        for(auto x:sc)
            if(a[x]>0)
                pq.push({a[x],x});
        af.push_back(sc);
    }
    cout<<af.size()<<"\n";
    for(int i=0;i<(int)af.size();i++)
    {
        cout<<1<<" ";
        for(int j=0;j<af[i].size();j++)
            cout<<af[i][j]<<" ";
        cout<<"\n";
    }
    return 0;
}
/**
4 2
2 3 3 2
*/

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:50:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         for(int j=0;j<af[i].size();j++)
      |                     ~^~~~~~~~~~~~~

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