Submission #362680

#	Time	Username	Problem	Language	Result	Execution time	Memory
362680		Lam_lai_cuoc_doi	Cake 3 (JOI19_cake3)	C++17	24 / 100	63 ms	64236 KiB

cake3

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;

const bool typetest = 0;
const int N = 2e3 + 5;
const ll Inf = 1e17;
int n, m;
struct Pakage
{
    ll c, v;
    bool operator<(const Pakage &a) const
    {
        return c < a.c;
    }
} a[N];
ll dp[N][N];

void Read()
{
    cin >> n >> m;
    for (int i = 1; i <= n; ++i)
        cin >> a[i].v >> a[i].c;
    sort(a + 1, a + n + 1);
}

template <class T>
void Max(T &x, T y)
{
    if (x < y)
        x = y;
}

void Solve()
{
    fill_n(&dp[0][0], N * N, -Inf);
    for (int i = 0; i <= n; ++i)
        dp[i][0] = 0;
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= i && j <= m; ++j)
        {
            Max(dp[i][j], dp[i - 1][j]);
            if (j == 1)
                Max(dp[i][j], dp[i - 1][j - 1] + a[i].v + 2 * a[i].c);
            else if (j == m)
                Max(dp[i][j], dp[i - 1][j - 1] + a[i].v - 2 * a[i].c);
            else
                Max(dp[i][j], dp[i - 1][j - 1] + a[i].v);
        }
    cout << dp[n][m];
}

int32_t main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t(1);
    if (typetest)
        cin >> t;
    for (int _ = 1; _ <= t; ++_)
    {
        Read();
        Solve();
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 19 / 19
• Subtask 3: 0 / 76