Submission #644419

#	Time	Username	Problem	Language	Result	Execution time	Memory
644419		Do_you_copy	Gift (IZhO18_nicegift)	C++17	49 / 100	1340 ms	524288 KiB

nicegift

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
using namespace std;
using ll = long long;
using pii = pair <int, int>;
#define pb push_back
const int maxN = 1e6 + 10;
const int maxOP = 3e6;
int n, k;
int a[maxN];
priority_queue <pii> PQ;

vector <vector <int>> e;
void Init(){
    cin >> n >> k;
    ll sum = 0;
    for (int i = 1; i <= n; ++i){
        cin >> a[i];
        sum += a[i];
        PQ.push({a[i], i});
    }
    if (sum % k || PQ.top().fi > sum / k){
        cout << -1; return;
    }
    while (sum){
        vector <int> pos;
        for (int j = 0; j < k; ++j){
            pos.pb(PQ.top().se);
            PQ.pop();
        }
        int add = a[pos.back()];
        if (PQ.top().fi) add = min(add, sum / k - PQ.top().fi);
        sum -= add * k;
        e.pb({add});
        for (int j = 0; j < k; ++j){
            e.back().pb(pos[j]);
            a[pos[j]] -= add;
            PQ.push({a[pos[j]], pos[j]});
        }
    }
    cout << e.size() << "\n";
    for (auto &i: e){
        for (auto &j: i) cout << j << " ";
        cout << "\n";
    }
}

signed main() {
    Init();
}

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