Submission #1037563

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037563		juicy	Road Construction (JOI21_road_construction)	C++17	100 / 100	1475 ms	8532 KiB

road_construction

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int N = 25e4 + 5;

int n, k, top;
long long res[N];
array<long long, 2> pt[N];

bool check(long long d) {
  top = 0;
  set<array<long long, 2>> st;
  for (int i = 1, j = 1; i <= n; ++i) {
    while (pt[i][0] - pt[j][0] > d) {
      st.erase({pt[j][1], pt[j][0]});
      ++j;
    }
    for (auto it = st.lower_bound({pt[i][1] - d, pt[i][0] - d}); it != st.end() && (*it)[0] <= pt[i][1] + d; ++it) {
      res[++top] = max(abs(pt[i][1] - (*it)[0]), pt[i][0] - (*it)[1]);
      if (top == k) {
        return 1;
      }
    }
    st.insert({pt[i][1], pt[i][0]});
  }
  return 0;
}

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  cin >> n >> k;
  for (int i = 1; i <= n; ++i) {
    int x, y; cin >> x >> y;
    pt[i] = {x + y, x - y};
  } 
  sort(pt + 1, pt + n + 1);
  long long L = 1, R = 4e9, p = R;
  while (L <= R) {
    long long md = (L + R) / 2;
    if (check(md)) {
      p = md;
      R = md - 1;
    } else {
      L = md + 1;
    }
  }
  check(p - 1);
  sort(res + 1, res + top + 1);
  while (top < k) {
    res[++top] = p;
  }
  for (int i = 1; i <= k; ++i) {
    cout << res[i] << "\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