Submission #1284786

#	Time	Username	Problem	Language	Result	Execution time	Memory
1284786		PlayVoltz	Road Construction (JOI21_road_construction)	C++20	100 / 100	1385 ms	18064 KiB

road_construction

#include <cstdio>
#include <stdio.h>
#include <stdbool.h>
#include <iostream>
#include <map>
#include <vector>
#include <climits>
#include <stack>
#include <string>
#include <queue>
#include <algorithm>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <cmath>
#include <cctype>
#include <bitset>
#include <iomanip>
#include <cstring>
#include <numeric>
#include <cassert>
#include <random>
using namespace std;

#define int long long
#define pii pair<int,int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

int n, k;
vector<pii> vect;

bool check(int mid){
	int c=0;
	multiset<int> s;
	for (int i=0, p=0; i<n; ++i){
		while (vect[p].fi<vect[i].fi-mid)s.erase(s.lower_bound(vect[p].se)), ++p;
		for (auto it=s.lower_bound(vect[i].se-mid); it!=s.end()&&*it<=vect[i].se+mid; ++it){
			++c;
			if (c>=k)return 0;
		}
		s.insert(vect[i].se);
	}
	return 1;
}

int32_t main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>k;
	vect.resize(n);
	for (int i=0, a, b; i<n; ++i)cin>>a>>b, vect[i]=mp(a-b, a+b);
	sort(vect.begin(), vect.end());
	int low=-1, high=LLONG_MAX/2;
	while (low+1<high){
		int mid=(low+high)/2;
		if (check(mid))low=mid;
		else high=mid;
	}
	multiset<pii> s;
	multiset<int> ans;
	for (int i=0, p=0; i<n; ++i){
		while (vect[p].fi<vect[i].fi-low)s.erase(s.lower_bound(mp(vect[p].se, p))), ++p;
		for (auto it=s.lower_bound(mp(vect[i].se-low, LLONG_MIN/2)); it!=s.end()&&it->fi<=vect[i].se+low; ++it){
			ans.insert(max(abs(vect[i].fi-vect[it->se].fi), abs(vect[i].se-vect[it->se].se)));
		}
		s.insert(mp(vect[i].se, i));
	}
	for (auto a:ans)cout<<a<<"\n";
	for (int i=0; i<k-ans.size(); ++i)cout<<low+1<<"\n";
}

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