Submission #243281

#	Time	Username	Problem	Language	Result	Execution time	Memory
243281		AmineWeslati	Lightning Rod (NOI18_lightningrod)	C++14	44 / 100	1907 ms	262144 KiB

Main

//Never stop trying
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//s.order_of_key(), *s.find_by_order()

using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef string str;
typedef long long ll;
#define int ll
typedef double db;
typedef long double ld;

typedef pair<int,int> pi;
#define fi first
#define se second

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<str> vs;
typedef vector<pi> vpi;

#define pb push_back
#define eb emplace_back
#define pf push_front

#define lb lower_bound
#define ub upper_bound

#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"

const int MOD = 1e9+7; //998244353
const ll INF = 1e18;
const int nx[4]={0,0,1,-1}, ny[4]={1,-1,0,0}; //right left down up

int32_t main(){
   boost;
   int N; cin>>N;
   int x[N],y[N];
   for(int i=0; i<N; i++) cin>>x[i]>>y[i];
   if(N>2000){
      int res=0;
      for(int i=0; i<N; i++){
         if(i && x[i]==x[i-1]) continue;
         res++;
      }
      cout << res << endl;
   }
   else{
      int res=0;
      set <pi,greater<pi>> s;
      for(int i=0; i<N; i++) s.insert({y[i],x[i]});
      while(!s.empty()){
         res++;
         auto it=s.begin();
         int y=(*it).fi,x=(*it).se;
         s.erase(it);
         vpi er;
         for(auto i: s) if(i.fi<y && abs(i.se-x)<=y-i.fi) er.pb(i);
         for(auto itt: er) s.erase(itt);
      }

      cout << res << endl;
   }

   return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20