Submission #939205

#	Time	Username	Problem	Language	Result	Execution time	Memory
939205		qwe1rt1yuiop1	Semiexpress (JOI17_semiexpress)	C++14	48 / 100	115 ms	23132 KiB

semiexpress

#include <bits/stdc++.h>
#define int long long
using namespace std;

void solve()
{
    int n, m, k, a, b, c, t;
    cin >> n >> m >> k >> a >> c >> b >> t;
    k -= m;
    vector<int> v(m);
    for (auto &i : v)
        cin >> i, --i;

    vector<vector<int>> add(m - 1, vector<int>(k + 1, 0));
    for (int i = 0; i < m - 1; ++i)
    {
        int lft = t - c * v[i];
        if (lft < 0)
            continue;
        add[i][0] = 1 + lft / a;
        add[i][0] = min(add[i][0], v[i + 1] - v[i]);
        lft -= b * add[i][0];
        for (int j = 1; j <= k && lft >= 0; ++j)
        {
            add[i][j] = 1 + lft / a;
            add[i][j] += add[i][j - 1];
            add[i][j] = min(add[i][j], v[i + 1] - v[i]);
            lft -= b * (add[i][j] - add[i][j - 1]);
        }
    }

    assert(k <= 500);

    // for (auto i : add)
    // {
    //     for (auto j : i)
    //         cout << j << ' ';
    //     cout << '\n';
    // }

    vector<vector<int>> dp(m - 1, vector<int>(k + 1, 0));
    dp[0] = add[0];
    for (int i = 1; i < m - 1; ++i)
    {
        dp[i] = dp[i - 1];
        for (int kk = 0; kk <= k; ++kk)
            dp[i][kk] = max(dp[i][kk], dp[i - 1][kk] + add[i][0]);
        for (int j = 1; j <= k; ++j)
            for (int kk = j; kk <= k; ++kk)
                dp[i][kk] = max(dp[i][kk], dp[i - 1][kk - j] + add[i][j]);
    }
    int ans = *max_element(dp[m - 2].begin(), dp[m - 2].end());
    if (c * v.back() > t)
        --ans;
    cout << ans << '\n';
}

/*
10 3 5
10 3 5
30
1 6 10

10 3 5
10 3 5
25
1 6 10

90 10 12
100000 1000 10000
10000
1
10 20 30 40 50 60 70 80 90
 */

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

    solve();

    return 0;
}

• Subtask 1: 18 / 18
• Subtask 2: 30 / 30
• Subtask 3: 0 / 52