Submission #658647

#	Time	Username	Problem	Language	Result	Execution time	Memory
658647		Darren0724	Let's Win the Election (JOI22_ho_t3)	C++17	10 / 100	11 ms	340 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(),x.end()
#define double long double
int INF=1e9;

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;cin>>n;
    int k;cin>>k;
    vector<int> a(n),b(n);
    for(int i=0;i<n;i++){
        cin>>a[i];
        cin>>b[i];
        if(b[i]==-1){
            b[i]=INF;
        }
    }
    double ans=INF;
    for(int i=0;i<=k;i++){
        double cnt=0;
        vector<bool> vis(n);
        vector<int> c(n);
        iota(all(c),0);
        sort(all(c),[&](int i,int j){return b[i]<b[j];});
        for(int j=0;j<i;j++){
            int p=c[j];
            vis[p]=1;
            cnt+=b[p]/(double)(j+1);
        }
        sort(all(c),[&](int i,int j){return a[i]<a[j];});
        int ptr=0;
        for(int j=0;j<k-i;j++){
            while(vis[c[ptr]]){
                ptr++;
            }
            int p=c[ptr];
            vis[p]=1;
            cnt+=a[p]/(double)(i+1);
            ptr++;
        }
        ans=min(ans,cnt);
    }
    cout<<fixed<<setprecision(9)<<ans<<endl;


    return 0;
}

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