Submission #1122583

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122583		LucaIlie	Let's Win the Election (JOI22_ho_t3)	C++20	16 / 100	2595 ms	432 KiB

Main

#include <bits/stdc++.h>

using namespace std;

struct state {
    int a, b;
};

const int MAX_N = 500;
const double INF = 1e9;
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 mask = 0; mask < (1 << n); mask++ ) {
        double cost = 0;
        int speakers = 1;
        vector<int> rest;
        bool ok = true;
        for ( int i = 0; i < n; i++ ) {
            if ( (mask >> i) & 1 ) {
                if ( states[i + 1].b == -1 )
                    ok = false;
                cost += (double)states[i + 1].b / speakers;
                speakers++;
            } else
                rest.push_back( states[i + 1].a );
        }
        if ( speakers >= k + 1 || !ok )
            continue;
        sort( rest.begin(), rest.end() );
        for ( int i = 0; i < k - speakers + 1; i++ )
            cost += (double)rest[i] / speakers;
        minCost = min( minCost, cost );
    }

    cout << minCost << "\n";

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

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

    cout << minCost << "\n";*/

    return 0;
}

• Subtask 1: 5 / 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