Submission #335288

#	Time	Username	Problem	Language	Result	Execution time	Memory
335288		limabeans	Gift (IZhO18_nicegift)	C++17	7 / 100	2101 ms	524292 KiB

nicegift

#include <bits/stdc++.h>
using namespace std;

template<typename T>
void out(T x) { cout << x << endl; exit(0); }
#define watch(x) cout << (#x) << " is " << (x) << endl





using ll = long long;


const int maxn = 1e6 + 5;

ll n,k;


int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);  cout.tie(0);

    cin>>n>>k;
    assert(k==2);
    priority_queue<pair<ll,int>> pq;
    ll sum=0;
    for (int i=1; i<=n; i++) {
	ll x;
	cin>>x;
	sum += x;
	pq.push({x,i});
    }

    if (sum%k) out(-1);

    vector<vector<int>> w;

    while (pq.size()) {
	auto cur = pq.top();
	pq.pop();
	auto cur2 = pq.top();
	pq.pop();
	w.push_back({cur.second,cur2.second});
	cur.first--;
	cur2.first--;
	if (cur.first) {
	    pq.push(cur);
	}
	if (cur2.first) {
	    pq.push(cur2);
	}
    }

    cout<<w.size()<<"\n";
    for (auto p: w) {
	cout<<1<<" "<<p[0]<<" "<<p[1]<<"\n";
    }
    
    
    return 0;
}

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