Submission #1267703

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267703		Sofiatpc	Let's Win the Election (JOI22_ho_t3)	C++20	11 / 100	82 ms	328 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define sc second
const int MAXN = 505;
const double INF = 1e6;
pair<double, double> v[MAXN]; // b a
double dp[2][MAXN];

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

    int n,k; cin>>n>>k;
    for(int i = 1; i <= n; i++)cin>>v[i].sc>>v[i].fi;
    sort(v+1,v+1+n);

    double ans = INF;
    for(int ini = 0; ini <= k; ini++){
        for(int x = 1; x <= ini; x++)dp[(n+1)%2][x] = INF;
        dp[(n+1)%2][0] = 0;

        for(int i = n; i >= 1; i--)
            for(int x = 0; x <= ini; x++){
                    dp[i%2][x] = dp[(i+1)%2][x] + (v[i].sc/(double(ini)+1));
                    if(x > 0 && v[i].fi != -1)
                        dp[i%2][x] = min( dp[i%2][x], dp[(i+1)%2][x-1] + (v[i].fi/(ini-x+1)) );
                }

        ans = min(ans, dp[1][ini]);
    }
    cout<<fixed<<setprecision(15)<<ans<<"\n";

}

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