Submission #92259

#	Time	Username	Problem	Language	Result	Execution time	Memory
92259		davitmarg	Gift (IZhO18_nicegift)	C++17	19 / 100	1046 ms	56460 KiB

nicegift

/*
DEATH-MATCH
Davit-Marg
*/
#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <stack>
#include <iterator>
#include <ctype.h>
#include <stdlib.h>  
#include <cassert>
#include <fstream>  
#define mod 998244353ll
#define LL long long
#define LD long double
#define MP make_pair
#define PB push_back
using namespace std;

LL gcd(LL a, LL b) {
	while (b) {
		a %= b;
		swap(a, b);
	}
	return a;
}

LL n, k, a[1000006], d, s;
bool hav = 1;
priority_queue<pair<LL, int>> q;
vector<pair<LL, int>> ans;
pair < LL, int > mn = {mod*mod,mod};
int main()
{
	cin >> n >> k;
	for (int i = 0; i < n; i++)
	{
		scanf("%lld", a + i);
		s += a[i];
		q.push(MP(a[i], i));
		mn = min(mn, MP(a[i], i));
		if (i && a[i] != a[i - 1])
			hav = 0;
	}


	if(!hav)
	{
		int step = 0;
		vector<pair<LL, int>> st;
		bool is = 1;
		while (!q.empty() && is)
		{
			for (int i = 0; i < k; i++)
			{
				if (q.empty())
				{
					cout << -1 << endl;
					return 0;
				}
				st.PB(q.top());
				q.pop();
			}
			LL d = st.back().first;
			if (!q.empty())
				d = min(st.back().first - q.top().first+1ll, d);
			if (st.back() == mn)
				is = 0;
			for (int i = k - 1; i >= 0; i--)
			{
				ans.PB(MP(d, st[i].second));
				a[st[i].second] -= d;
				if (st[i].first - d > 0)
					q.push(MP(st[i].first - d, st[i].second));
				st.pop_back();
			}
		}

		if (!q.empty() || !st.empty())
		{
			cout << -1 << endl;
			return 0;
		}
	}

	if (a[0])
	{
		d = k / gcd(n, k);
		if (a[0] % d != 0)
		{
			cout << -1 << endl;
			return 0;
		}
		for (LL i = 0; i < d*n; i++)
			ans.PB(MP(a[0] / d,i%n));
	}

	cout << ans.size() / k;
	for (int i = 0; i < ans.size(); i++)
	{
		if (i%k == 0)
			cout << endl << ans[i].first << " ";
		cout << ans[i].second + 1 << " ";
	}
	cout << endl;

	return 0;
}

/*

4 2
1 1 4 4

4 3
6 6 6 6

14 7
10 10 10 10 10 10 10 10 10 10 10 10 10 10

*/

Compilation message (stderr)

nicegift.cpp: In function 'int main()':
nicegift.cpp:57:7: warning: unused variable 'step' [-Wunused-variable]
   int step = 0;
       ^~~~
nicegift.cpp:107:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < ans.size(); i++)
                  ~~^~~~~~~~~~~~
nicegift.cpp:46:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld", a + i);
   ~~~~~^~~~~~~~~~~~~~~

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