Submission #787507

#	Time	Username	Problem	Language	Result	Execution time	Memory
787507		willychan	Gift (IZhO18_nicegift)	C++14	30 / 100	26 ms	4180 KiB

nicegift

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
//#include<bits/extc++.h>
//__gnu_pbds




int main(){
	ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	int n,k;cin>>n>>k;
	ll asum=0;
	vector<int> arr(n);
	int maxn = 0;
	for(int i=0;i<n;i++){
		cin>>arr[i];
		asum+=arr[i];
		maxn = max(maxn,arr[i]);
	}
	if(asum%k){
		cout<<-1<<"\n";
		return 0;
	}
	if(maxn>asum/k){
		cout<<-1<<"\n";
		return 0;
	}
	priority_queue<pair<int,int> > pq;
	for(int i=0;i<n;i++){
		pq.push({arr[i],i});
	}
	cout<<asum/k<<"\n";
	for(int t=0;t<asum/k;t++){
		cout<<1;
		vector<int> use;
		for(int i=0;i<k;i++){
			int p = pq.top().second;
			pq.pop();
			cout<<" "<<p+1;
			arr[p]--;
			use.push_back(p);
		}
		for(auto i : use){
			pq.push({arr[i],i});
		}
		cout<<"\n";
	}
	
	
	return 0;
}

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