Submission #973617

#	Time	Username	Problem	Language	Result	Execution time	Memory
973617		berr	Let's Win the Election (JOI22_ho_t3)	C++17	56 / 100	2568 ms	2644 KiB

Main

#include <bits/stdc++.h>
using namespace std;
const int N = 505;
 
double dp[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]; 
    });
    

    auto calc=[&](int e){
       
        for(int i=0; i<=n+1; i++){
            for(int l=0; l<=n+1; l++){
                dp[i][l]=1e9;
            }
        }
     
        dp[0][0]=0;
        for(int i=0; i<n; i++){
            for(int l=e; l>=0; l--){
                for(int x=n; x>=0; x--){
                  //  cout<<(double)a[i][1]/(double)(l+1)<<"\n";
                    if(a[i][1]!=-1)
                        dp[l+1][x] =min<double>(dp[l+1][x], dp[l][x]+(double)a[i][1]/(double)(l+1));
                    dp[l][x+1]=min<double>(dp[l][x+1], dp[l][x]+((double)a[i][0]/(double)(e+1)));
                }
            }
        }

        return dp[e][k-e];

    };
    double ans=1e9;
    for(int i=0; i<=k; i++){
        ans=min(ans, calc(i));
    }
    
    cout<<setprecision(9)<<ans<<"\n";
}

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