Submission #1122572

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122572		LucaIlie	Let's Win the Election (JOI22_ho_t3)	C++20	11 / 100	2595 ms	4164 KiB

Main

#include <bits/stdc++.h>

using namespace std;

struct state {
    int a, b;
};

const int MAX_N = 500;
const double INF = 1e6;
state states[MAX_N + 1];
double dp[2][MAX_N + 1][MAX_N + 1];

int main() {
    int n, k;
    cout << fixed << setprecision( 15 );

    cin >> n >> k;
    for ( int i = 1; i <= n; i++ )
        cin >> states[i].a >> states[i].b;

    sort( states + 1, states + n, []( state x, state y ) { return x.b < y.b; } );

    double minCost = INF;
    for ( int totalB = 0; totalB <= k; totalB++ ) {
        bool side = 0;
        for ( int a = 0; a <= k; a++ ) {
            for ( int b = 0; a + b <= k; b++ )
                dp[side][a][b] = INF;
        }
        dp[side][0][0] = 0.0;
        for ( int i = 1; i <= n; i++ ) {
            side ^= 1;
            for ( int a = 0; a <= k; a++ ) {
                for ( int b = 0; b <= k - a; b++ )
                    dp[side][a][b] = dp[1 - side][a][b];
            }
            for ( int a = 0; a <= k; a++ ) {
                for ( int b = 0; b <= k - a; b++ ) {
                    dp[side][a + 1][b] = min( dp[side][a + 1][b], dp[side ^ 1][a][b] + (double)states[i].a / (totalB + 1));
                    if ( states[i].b != -1 )
                        dp[side][a][b + 1] = min( dp[side][a][b + 1], dp[side ^ 1][a][b] + (double)states[i].b / (b + 1));
                }
            }
        }

        minCost = min( minCost, dp[side][k - totalB][totalB] );
    }

    cout << minCost << "\n";

    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 5
• Subtask 3: 11 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23