Submission #1107880

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107880		Muhammet	Gift (IZhO18_nicegift)	C++17	18 / 100	20 ms	4308 KiB

nicegift

#include <bits/stdc++.h>

using namespace std;

#define sz(s) (int)s.size()
#define ff first
#define ss second

int main(){
	ios::sync_with_stdio(false); cin.tie(nullptr);
	int n, k;
	cin >> n >> k;
	vector <int> a(n);
	multiset <pair<int,int>> s;
	for(int i = 0; i < n; i++){
		cin >> a[i];
		if(a[i] == 0) continue;
		s.insert({a[i],i+1});
	}
	vector <pair<int,int>> v;
	while(sz(s) > 1){
		pair <int,int> x = *(--s.end());
		s.erase(--s.end());
		pair <int,int> y = *(--s.end());
		s.erase(--s.end());
		x.ff--;
		y.ff--;
		if(x.ff != 0) s.insert(x);
		if(y.ff != 0) s.insert(y);
		v.push_back({x.ss,y.ss});
	}
	if(sz(s) == 1){
		cout << -1;
		return 0;
	}
	cout << sz(v) << "\n";
	for(auto i : v){
		cout << 1 << ' ' << i.ff << ' ' << i.ss << '\n';

	}
}

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