Submission #592043

#	Time	Username	Problem	Language	Result	Execution time	Memory
592043		tutis	Uplifting Excursion (BOI22_vault)	C++17	0 / 100	1 ms	212 KiB

vault

/*input
1 5
0 0 6

*/

#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];
	for (int i = 0; i <= 2 * M; i++)
		cin >> A[i];
	L = -L;
	ll cnt = 0;
	for (int l = -M; l <= M; l++)
	{
		L += l * A[l + M];
		cnt += A[l + M];
	}
	map<ll, ll>D;
	D[0] = 0;
	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;
				ll lo = max(0ll, k - M + 1);
				ll hi = min(k + M + 1, A[l + M]);
				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 << cnt - D[L] << "\n";
	else
		cout << "impossible\n";
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3-1: 0 / 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