Submission #303547

#	Time	Username	Problem	Language	Result	Execution time	Memory
303547		tutis	Packing Biscuits (IOI20_biscuits)	C++17	21 / 100	1099 ms	20768 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
typedef long long ll;
using namespace __gnu_pbds;
ll count_tastiness(ll x, vector<ll> a)
{
	while (a.size() <= 60)
		a.push_back(0);
	ll s[61];
	s[60] = 0;
	pair<ll, ll>s1[61];
	s1[60] = {0, 0};
	for (int i = 59; i >= 0; i--)
	{
		s[i] = a[i] + s[i + 1] * 2;
		if (s[i] >= 3 * x)
			s[i] = 3 * x;
		s1[i].first = s1[i + 1].first * 2;
		s1[i].second = s1[i + 1].second * 2 + a[i];
		ll d = s1[i].second / x;
		s1[i].second -= x * d;
		s1[i].first += d;
		s1[i].first = min(s1[i].first, 4000000000000000000ll);
	}
	map<ll, ll, greater<ll>>M[61];
	function<ll(ll, int)>get = [&](ll d, int i)->ll
	{
		if (i == 60)
			return d / x + 1;
		if (s[i] + d < x)
			return 1;
		if (s[i] + d < 2 * x)
		{
			if (a[i] + d >= x)
				return 2;
			else
				return 1;
		}
		if (s[i] + d < 3 * x)
		{
			ll ret = 1;
			if (a[i] + d >= x)
				ret++;
			if ((a[i] + d) / 2 + a[i + 1] >= x)
				ret++;
			return ret;
		}
		ll mx = s1[i].first + 1;
		if (s1[i].second + d >= x)
			mx++;
		auto it = M[i].lower_bound(d);
		if (it != M[i].end() && (it->second == mx || it->first == d))
			return it->second;
		if (a[i] + d < x)
		{
			return M[i][d] = get((d + a[i]) / 2, i + 1);
		}
		else
		{
			return M[i][d] = get((d + a[i]) / 2, i + 1) + get((d + a[i] - x) / 2, i + 1);
		}
	};
	return get(0, 0);
}

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 0 / 21
• Subtask 4: 0 / 35
• Subtask 5: 0 / 23