Submission #1041042

#	Time	Username	Problem	Language	Result	Execution time	Memory
1041042		alexdd	Road Construction (JOI21_road_construction)	C++17	0 / 100	6534 ms	7692 KiB

road_construction

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int INF = 4e9;
int n,cate,k;
pair<int,int> p[250005];
vector<int> sol;
int afis(int lim, bool bl)
{
    int poz=1,cnt=0;
    set<pair<int,int>> s;
    for(int i=1;i<=n;i++)
    {
        while(p[i].first-p[poz].first>lim)
        {
            s.erase({p[poz].second,p[poz].first});
            poz++;
        }
        //for(auto it = s.lower_bound({p[i].second-lim,-INF});it!=s.lower_bound({p[i].second+lim,INF});it++)
        for(auto it = s.begin();it!=s.end();it++)
        {
            if((*it).second < p[i].second-lim || (*it).second > p[i].second+lim)
                continue;
            if(bl) sol.push_back(max(abs(p[i].first-(*it).second),abs(p[i].second-(*it).first)));
            cnt++;
            if(cnt==k)
                return k;
        }
        s.insert({p[i].second,p[i].first});
    }
    return cnt;
}
signed main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    cin>>n>>k;
    for(int i=1;i<=n;i++)
    {
        cin>>p[i].first>>p[i].second;
        p[i] = {p[i].first+p[i].second, p[i].first-p[i].second};
    }
    sort(p+1,p+1+n);
    int st=1,dr=INF,ans=INF;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(afis(mij,0)>=k)
        {
            ans=mij;
            dr=mij-1;
        }
        else
            st=mij+1;
    }
    afis(ans,1);
    assert((int)sol.size()==k);
    sort(sol.begin(),sol.end());
    for(auto x:sol)
        cout<<x<<"\n";
    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 20
• Subtask 5: 0 / 27
• Subtask 6: 0 / 35