Submission #798237

#	Time	Username	Problem	Language	Result	Execution time	Memory
798237		vjudge1	Road Construction (JOI21_road_construction)	C++17	6 / 100	311 ms	7608 KiB

road_construction

#include<bits/stdc++.h>

using namespace std;
using ll = long long;


int n, k;
vector<pair<int, int>> v;

vector<int> ans;

bool check(ll mid) {

    ans.clear();
    set<pair<ll, ll>> st;
    st.insert({v[0].second, 0});
    int l = 0;
    for(int i = 1; i < n; i++) {
        while(v[i].first - v[l].first > mid) {
            st.erase({v[l].second, l});
            l++;
        }
        auto it = st.lower_bound({v[i].second - mid, -1});
        while(it != st.end() && abs(v[i].second - it->first) <= mid) {
            ans.push_back({max(abs(v[i].first - v[it->second].first), abs(v[i].second - v[it->second].second))});
            it++;
        }
        if((int)ans.size() > k) return 0;
        st.insert({v[i].second, i});
    }
    // cout << mid << ':' << ' ';
    // for(int c : ans) cout << c << ' ';
    // cout << '\n';
    return 1;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin >> n >> k;
    v.resize(n);
    for(int i = 0; i < n; i++) {
        int x, y;
        cin >> x >> y;
        v[i] = {x + y, x - y};
    }
    sort(v.begin(), v.end());
    // for(auto [x, y] : v) cout << '{' << x << ' ' << y << '}' << ' ';
    // cout << '\n';
    ll l = 0, r = (ll)1e10;
    while(r - l > 1) {
        ll mid = (l + r) / 2;
        if(check(mid)) l = mid;
        else r = mid;
    }
    check(l);
    // cout << l << ' ' << r << '\n';
    sort(ans.begin(), ans.end());
    while((int)ans.size() < k) ans.push_back(r);
    for(int c : ans) 
        cout << c << '\n';
}

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