Submission #237255

#	Time	Username	Problem	Language	Result	Execution time	Memory
237255		kshitij_sodani	Gift (IZhO18_nicegift)	C++17	30 / 100	145 ms	4480 KiB

nicegift

#include <bits/stdc++.h>
using namespace std;
typedef int64_t llo;
#define mp make_pair
#define pb push_back
#define a first
#define b second
int it[1000001];
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n,k;
	cin>>n>>k;
	priority_queue<pair<int,int>> x;
	int ko=1;
	for(int i=0;i<n;i++){
		cin>>it[i];
		if(it[i]>0){
			x.push({it[i],i});
		}
		if(i>0){
			if(it[i]!=it[i-1]){
				ko=0;
			}
		}
	}
	if(ko){
		int aa=n/__gcd(n,k);
	//	cout<<aa<<endl;
		if((it[0]*n)%aa!=0){
			cout<<-1<<endl;
			return 0;
		}
		deque<int> cur;
		for(int i=0;i<n;i++){
			cur.pb(i);
		}
		cout<<aa<<endl;
		for(int i=0;i<aa;i++){
			cout<<((it[0]*n)/(aa*k))<<" ";
			for(int j=0;j<k;j++){
				int x=cur.front();
				cur.pop_front();
				cur.pb(x);
				cout<<x+1<<" ";
			}
			cout<<endl;
		}

		return 0;
	}
	int st=0;
	vector<vector<int>> ans;
	while(x.size()){
		if(x.size()<k){
			st=1;
			break;
		}
		ans.pb({});
		vector<pair<int,int>> kk;
		for(int i=0;i<k;i++){
			pair<int,int> no=x.top();
			x.pop();
			ans.back().pb(no.b);
			kk.pb(no);
		}
		for(auto j:kk){
			if(j.a>1){
				x.push({j.a-1,j.b});
			}
		}
	}
	if(st){
		cout<<-1<<endl;
	}
	else{
		cout<<ans.size()<<endl;
		for(auto j:ans){
			cout<<1<<" ";
			for(auto i:j){
				cout<<i+1<<" ";
			}
			cout<<endl;
		}
	}




 
 
 
	return 0;
}

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:55:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(x.size()<k){
      ~~~~~~~~^~

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