Submission #592068

#	Time	Username	Problem	Language	Result	Execution time	Memory
592068		tutis	Uplifting Excursion (BOI22_vault)	C++17	10 / 100	5098 ms	5672 KiB

vault

/*input
2 5
2 3 1 1 4

*/

#pragma GCC optimize ("O3")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
template <typename T>
using oset = tree<T,  null_type,  less<T>,  rb_tree_tag,  tree_order_statistics_node_update>;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int M;
	ll L;
	cin >> M >> L;
	ll A_[2 * M + 1];
	ll* A = A_ + M;
	for (int i = -M; i <= M; i++)
		cin >> A[i];
	ll pl = 0;
	for (int v = M; v >= 1; v--)
	{
		while (A[v] > 0 && A[-v] > 0)
		{
			if (abs(L) < v && A[v] > 1 && A[-v] > 1)
			{
				ll x = min(A[v] - 1, A[-v] - 1);
				A[v] -= x;
				A[-v] -= x;
				pl += 2 * x;
				continue;
			}
			if (L > 0)
			{
				ll k = min(A[v], max(1ll, L / v));
				A[v] -= k;
				L -= v * k;
				pl += k;
			}
			else
			{
				ll k = min(A[-v], max(1ll, L / v));
				A[-v] -= k;
				L += v * k;
				pl += k;
			}
		}
	}
	L = -L;
	ll cnt = 0;
	for (int l = -M; l <= M; l++)
	{
		L += l * A[l];
		cnt += A[l];
	}
	map<ll, ll>D;
	D[0] = 0;
	ll del = 50;
	for (int v = M; v >= 1; v--)
		for (int l : {v, -v})
		{
			map<ll, ll>D_;
			for (pair<ll, ll>v : D)
			{
				ll k = (L - v.first) / l;
				k = max(k, 0ll);
				k = min(k, A[l]);
				ll lo = max(0ll, k - del);
				ll hi = min(k + del, A[l]);
				for (ll c = lo; c <= hi; c++)
				{
					ll v_ = v.first + l * c;
					ll c_ = v.second + c;
					if (D_.count(v_) == 0)
						D_[v_] = c_;
					else
						D_[v_] = min(D_[v_], c_);
				}
			}
			D = D_;
		}
	if (D.count(L))
		cout << pl + cnt - D[L] << "\n";
	else
		cout << "impossible\n";
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3-1: 10 / 10
• Subtask 3-2: 0 / 10
• Subtask 4-1: 0 / 10
• Subtask 4-2: 0 / 10
• Subtask 5-1: 0 / 10
• Subtask 5-2: 0 / 10
• Subtask 6-1: 0 / 10
• Subtask 6-2: 0 / 10