Submission #922092

#	Time	Username	Problem	Language	Result	Execution time	Memory
922092		guagua0407	Road Construction (JOI21_road_construction)	C++17	100 / 100	1858 ms	6320 KiB

road_construction

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int inf=2e9+5;
int n,k;
vector<pair<int,int>> vec;
vector<ll> ans;

bool check(ll d){
    int l=0;
    set<pair<int,int>> S;
    ans.clear();
    for(int r=0;r<n;r++){
        while(vec[l].f<max(-(ll)inf,(ll)vec[r].f-d)){
            S.erase({vec[l].s,l});
            l++;
        }
        auto it2=S.upper_bound({min((ll)inf,(ll)vec[r].s+d),inf});
        for(auto it=S.lower_bound({max(-(ll)inf,(ll)vec[r].s-d),-inf});it!=it2;it++){
            int x=(*it).s;
            ans.push_back(max(abs((ll)vec[x].f-(ll)vec[r].f),abs((ll)vec[x].s-(ll)vec[r].s)));
            if((int)ans.size()>=k) return true;
        }
        S.insert({vec[r].s,r});
    }
    return false;
}

int main() {_
    cin>>n>>k;
    for(int i=0;i<n;i++){
        int x,y;
        cin>>x>>y;
        int xx=y+x;
        int yy=y-x;
        vec.push_back({xx,yy});
    }
    sort(all(vec));
    ll l=0,r=(ll)4e9;
    while(l<r){
        ll mid=(l+r)/2;
        if(check(mid)){
            r=mid;
        }
        else{
            l=mid+1;
        }
    }
    check(l-1);
    sort(all(ans));
    while((int)ans.size()<k) ans.push_back(l);
    for(auto v:ans){
        cout<<v<<'\n';
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//laborz

Compilation message (stderr)

road_construction.cpp: In function 'void setIO(std::string)':
road_construction.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
road_construction.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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