Submission #794818

#	Time	Username	Problem	Language	Result	Execution time	Memory
794818		fuad27	Road Construction (JOI21_road_construction)	C++17	100 / 100	3463 ms	28900 KiB

road_construction

#include<bits/stdc++.h>
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
const int N=250010;
int n, k;
vector<pair<long long,long long>> p;
vector<long long> res;
const long long inf=1e18;
bool check(long long dist) {
  res.clear();
  multiset<pair<long long, long long>> s;
  int p1=0;
  for(int i = 0;i<(int)p.size();i++) {
    while(p[i].first-p[p1].first>dist) {
      s.erase(s.find({p[p1].second, p[p1].first}));
      p1++;
    }
    auto it1=s.lower_bound({p[i].second-dist, -inf}), it2=s.upper_bound({p[i].second+dist+1, -inf});
    while(it1!=it2 and (int)res.size()<k) {
      res.push_back(max(abs(p[i].first-(*it1).second), abs(p[i].second-(*it1).first)));
      it1++;
    }
    s.insert({p[i].second, p[i].first});
  }
  return (int)res.size()==k;
}
int main () {
  cin.tie(0)->sync_with_stdio(0);
  cin >> n >> k;
  for(int i = 0;i<n;i++) {
    long long x, y;
    cin >> x >> y;
    p.push_back({x+y, y-x});
  }
  sort(p.begin(), p.end());
  long long lo = 0, hi = 1e10;
  while(lo < hi) {
    long long mid=(lo+hi-1)>>1;
    if(check(mid)) {
      hi=mid;
    }
    else {
      lo=mid+1;
    }
  }
  check(lo-1);
  sort(res.begin(), res.end());
  for(long long i:res)cout << i << "\n";
  for(int i = res.size();i<k;i++)cout << lo << "\n";
  return 0;
}

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