Submission #973590

#	Time	Username	Problem	Language	Result	Execution time	Memory
973590		berr	Let's Win the Election (JOI22_ho_t3)	C++17	0 / 100	1091 ms	8404 KiB

Main

#include <bits/stdc++.h>
using namespace std;
const int N = 505;

array<double, 2> dpold[N][N], dpnew[N][N];
 
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int n, k; cin >> n >> k;
    vector<array<int, 2>> a(n);

    for(auto &[i, l]: a) cin >> i >> l;

    sort(a.begin(), a.end(), [&](auto x, auto y){
        if(x[1]==y[1]) return x[0] < y[0];
        else if(y[1]==-1) return true;
        else if(x[1]==-1) return false;
         return x[1]<y[1]; 
    });
    

    for(int i=0; i<=n+1; i++){
        for(int l=0; l<=n+1; l++){
            dpold[i][l]={1e9, 1e9};
        }
    }

    dpold[0][0]={0, 0};

    for(int i=0; i<n; i++){
        for(int i=0; i<=n+1; i++){
            for(int l=0; l<=n+1; l++){
                dpnew[i][l]={1e9, 1e9};
            }
        }


        for(int l=n; l>=0; l--){
            for(int x=n; x>=0; x--){
              //  cout<<(double)a[i][1]/(double)(l+1)<<"\n";
                dpnew[l+1][x]=min(dpnew[l+1][x], {dpold[l][x][0]+(double)a[i][1]/(double)(l+1), dpold[l][x][1]});
          
                dpnew[l][x+1]=min(dpnew[l][x+1], {dpold[l][x][0], dpold[l][x][1]+(double)a[i][0]});
            }
        }
        for(int i=0; i<=n+1; i++){
            for(int l=0; l<=n+1; l++){
                dpold[i][l]=min(dpold[i][l], dpnew[i][l]);
            }
        }


    }
    double ans=1e9;
    for(int i=0; i<=k; i++){

        ans=min(ans, dpold[i][k-i][0]+(double)dpold[i][k-i][1]/(double)(i+1));
    }

    cout<<setprecision(9)<<fixed<<ans<<"\n";
}

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