Submission #564565

#	Time	Username	Problem	Language	Result	Execution time	Memory
564565		Uzouf	Building Skyscrapers (CEOI19_skyscrapers)	C++14	54 / 100	647 ms	89404 KiB

skyscrapers

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define int long long
#define endl "\n"
int mod=1e9+7;
const int N=2e5+5;
template<class x>
using ordered_multiset = tree<x, null_type,less_equal<x>, rb_tree_tag,tree_order_statistics_node_update>;

int n,t;
map<pair<int,int>,bool> mp;
map<pair<int,int>,bool> vis;
map<pair<int,int>,int> plc;
vector<pair<int,int> > v;
vector<pair<int,int> > vv;

int dx[8]={0,0,1,-1,1,-1,-1,1};
int dy[8]={1,-1,0,0,1,-1,1,-1};

signed main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    //freopen(".in", "r", stdin); freopen(".out", "w", stdout);

    cin>>n>>t;
    for (int i=0;i<n;i++) {
      int x,y; cin>>x>>y;
      mp[{x,y}]=true;
      plc[{x,y}]=i+1;
      v.push_back({x,y});
      vv.push_back({y,x});
    }
    sort(v.begin(),v.end());

    priority_queue<pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> >  > q;

    int fx=v[0].first,fy=v[0].second;
    int lx=v[n-1].first,ly=v[n-1].second;
    vector<pair<int,pair<int,int> > >br;
    for (auto i:v) {
      if (i.first==fx && !vis[i]) {
        br.push_back({plc[i],i});
      }
      if (i.second==fy && !vis[i]) {
        br.push_back({plc[i],i});
      }
      if (i.first==lx && !vis[i]) {
        br.push_back({plc[i],i});
      }
      if (i.second==ly && !vis[i]) {
        br.push_back({plc[i],i});
      }
    }
    sort(br.begin(),br.end());
    q.push(br[0].second); vis[br[0].second]=true;

    vector<int> ans;

    while (!q.empty()) {
      int x=q.top().first,y=q.top().second;
      q.pop();
      ans.push_back(plc[{x,y}]);

      for (int i=0;i<8;i++) {
        int xx=x+dx[i],yy=y+dy[i];
        if (!vis[{xx,yy}] && mp[{xx,yy}]) {
          q.push({xx,yy}); vis[{xx,yy}]=true;
        }

      }
    }

    for (auto i:v) {
      if (!vis[i]) {
        cout<<"NO"; return 0;
      }
    }

    cout<<"YES"<<endl;
    for (int i:ans) cout<<i<<endl;

}

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 12 / 12
• Subtask 4: 0 / 17
• Subtask 5: 20 / 20
• Subtask 6: 0 / 10
• Subtask 7: 0 / 19