Submission #378808

#	Time	Username	Problem	Language	Result	Execution time	Memory
378808		8e7	Gift (IZhO18_nicegift)	C++14	30 / 100	2075 ms	47884 KiB

nicegift

//Challenge: Accepted
#include <iostream>
#include <algorithm>
#include <vector>
#include <utility>
#include <queue>
#define ll long long
#define maxn 1000005
#define pii pair<int, ll>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
using namespace std;
ll a[maxn], pref[maxn], val[maxn];
vector<ll> ans[maxn];
int main() {
	io
	ll n, k;
	cin >> n >> k;
	ll m = 0;
	for (int i = 0;i < n;i++) {
		cin >> a[i];
		m += a[i];
		pref[i] = m;
	}

	bool poss = m % k == 0;
	ll siz = m / k;
	int vs = 0;

	for (int i = 0;i < n;i++) {
		if (a[i] > siz) {
			poss = false;
			break;
		}
		val[vs++] = pref[i] % siz;
	}
	val[vs++] = siz;
	sort(val, val + vs);
	if (!poss) {
		cout << -1 << endl;
	} else {
		int num = 0, ind = 0;
		ll cur = 0;
		for (int i = 0;i < vs;i++) {
			//cout << val[i] << " " << cur << endl;
			if (val[i] - cur > 0) { //[cur, val[i])
				while (ind < n && pref[ind] <= cur) ind++;
				ans[num].push_back(val[i] - cur);
				int id = ind;
				for (ll j = cur;j < m;j += m / k) {
					while (id < n && pref[id] <= j) id++;
					if (id < n) ans[num].push_back(id+1);
				}
				cur = val[i];
				num++;
			}
		}
		cout << num << "\n";
		for (int i = 0;i < num;i++) {
			for (int j:ans[i]) cout << j << " ";
			cout << "\n";
		}
	}
}
/*
4 2
2 3 3 2

6 4
4 1 3 5 5 2
10 4
6 6 6 6 6 6 6 6 6 6
 */

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