Submission #1169680

#	Time	Username	Problem	Language	Result	Execution time	Memory
1169680		SmuggingSpun	Road Construction (JOI21_road_construction)	C++20	11 / 100	88 ms	7616 KiB

road_construction

#include<bits/stdc++.h>
#define taskname "B"
using namespace std;
typedef long long ll;
const int lim = 25e4 + 5;
const ll INF = 5e9;
int n, k;
ll x[lim], y[lim];
namespace sub1{
    void solve(){
        vector<ll>a;
        for(int i = 1; i < n; i++){
            for(int j = i + 1; j <= n; j++){
                a.emplace_back(abs(x[i] - x[j]) + abs(y[i] - y[j]));
            }
        }
        sort(a.begin(), a.end());
        for(int i = 0; i < k; i++){
            cout << a[i] << "\n";
        }
    }
}
namespace sub2{
    void solve(){
        sort(x + 1, x + n + 1);
        ll low = 1, high = INF, d = 0;
        while(low <= high){
            ll mid = (low + high) >> 1LL;
            int cnt = 0;
            for(int i = 1, j = 1; i <= n; i++){
                while(x[i] - x[j] > mid){
                    j++;
                }
                if((cnt += i - j) >= k){
                    break;
                }
            }
            if(cnt >= k){
                high = (d = mid) - 1;
            }
            else{
                low = mid + 1;
            }
        }
        vector<ll>ans;
        for(int i = 1; i <= n; i++){
            for(int j = i - 1; j > 0 && x[i] - x[j] < d; j--){
                ans.emplace_back(x[i] - x[j]);
            }
        }
        sort(ans.begin(), ans.end());
        for(ll& x : ans){
            cout << x << "\n";
        }
        for(int i = ans.size(); i < k; i++){
            cout << d << "\n";
        }
    }
}
int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if(fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
    }
    cin >> n >> k;
    for(int i = 1; i <= n; i++){
        cin >> x[i] >> y[i];
    }
    if(n <= 1000){
        sub1::solve();
    }
    else if(count(y + 1, y + n + 1, 0) == n){
        sub2::solve();
    }
}

Compilation message (stderr)

road_construction.cpp: In function 'int main()':
road_construction.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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