Submission #819507

#	Time	Username	Problem	Language	Result	Execution time	Memory
819507		LucaIlie	Cake 3 (JOI19_cake3)	C++17	5 / 100	4065 ms	22476 KiB

cake3

#include <bits/stdc++.h>

using namespace std;

struct ab {
    int a, b;
};

const int MAX_N = 5000;
const long long INF = 1e18;
ab v[MAX_N];
long long dp[MAX_N][MAX_N];

int main() {
    int n, m;

    cin >> n >> m;
    for ( int i = 1; i <= n; i++ )
        cin >> v[i].a >> v[i].b;
    sort( v + 1, v + 1 + n, []( ab x, ab y ) {
        return x.b < y.b;
    } );

    for ( int i = 1; i <= n; i++ ) {
        dp[i][0] = -INF;
        dp[i][1] = v[i].a;
        for ( int k = 2; k <= m; k++ ) {
            dp[i][k] = -INF;
            for ( int j = 1; j < i; j++ )
                dp[i][k] = max( dp[i][k], dp[j][k - 1] + v[i].a - 2 * (v[i].b - v[j].b) );
        }
    }

    long long ans = -INF;
    for ( int i = 1; i <= n; i++ )
        ans = max( ans, dp[i][m] );
    cout << ans;

    return 0;
}

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