Submission #707717

#	Time	Username	Problem	Language	Result	Execution time	Memory
707717		Johann	Uplifting Excursion (BOI22_vault)	C++14	0 / 100	616 ms	20384 KiB

vault

#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef pair<ll, ll> pii;
typedef vector<pii> vpii;
typedef vector<ll> vi;
#define sz(x) (int)(x).size()

const int MAXSIZE = 1000000;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    ll M, L;
    cin >> M >> L;
    vi A(2 * M + 1);
    for (int i = 0; i < sz(A); ++i)
        cin >> A[i];

    vi dp(MAXSIZE, -1);
    ll center = MAXSIZE / 2;
    dp[center] = A[M];
    for (ll m = 1; m <= M; ++m)
    {
        ll maxNum = A[m + M];
        for (ll r = 0; r < m; ++r)
        {
            priority_queue<pii, vpii> q;
            for (int i = 0; m * i + r < sz(dp); ++i)
            {
                int idx = m * i + r;
                while (!q.empty() && q.top().second < idx - maxNum * m)
                    q.pop();
                if (dp[idx] != -1)
                    q.push({dp[idx] - i, idx});
                if (!q.empty())
                    dp[idx] = i + q.top().first;
            }
        }
    }

    ll ans = dp[center + L];
    if (ans == -1)
        cout << "impossible\n";
    else
        cout << ans << "\n";

    return 0;
}

• 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