Submission #955431

#	Time	Username	Problem	Language	Result	Execution time	Memory
955431		vjudge1	IOI Fever (JOI21_fever)	C++17	25 / 100	5030 ms	77132 KiB

fever

#include <bits/stdc++.h>
 
#pragma optimize("Ofast")
#pragma target("avx2")
 
using namespace std;
 
#define ll long long
#define ld long double
#define pb push_back
#define pf push_front
#define pii pair<int,int>
#define all(v) v.begin(),v.end()
#define F first
#define S second
#define mem(a,i) memset(a,i,sizeof(a))
#define sz(s) (int)s.size()
#define y1 yy
#define ppb pop_back
#define lb lower_bound
#define ub upper_bound
#define gcd(a,b) __gcd(a,b)
#define in insert
#define int ll
 
const int MAX=1e6+15;
const int B=300;
const int N=104;
const int block=400;
const int maxB=MAX/B+10;
const ll inf=1e18;  
const int mod=998244353;
const int mod1=1e9+9;
const ld eps=1e-9;
 
// int dx[8]={1,0,-1,0,1,-1,-1,1};
// int dy[8]={0,1,0,-1,1,-1,1,-1};
 
int binpow(int a,int n){
  if(!n)return 1;
  if(n%2==1)return a*binpow(a,n-1)%mod;
  int k=binpow(a,n/2);
  return k*k%mod;
}
 
int n;
pii a[MAX];
int b[MAX];
int d[MAX];
int dx[MAX],dy[MAX];
vector<int> vx[MAX],vy[MAX];
int ans;

void calc(int start,int nap){
  b[start]=nap;
  set<pii> st;
  for(int i=1;i<=n;i++)d[i]=inf;
  d[start]=0;
  st.in({0,start});
  while(!st.empty()){
    int v=st.begin()->S;
    st.erase(st.begin());
    for(auto to:vx[dx[v]]){
      if(to==v)continue;
      if(d[to]>abs(a[v].F-a[to].F)&&d[v]<abs(a[v].F-a[to].F)){
        if(b[v]==1){
          if(a[to].F<a[v].F){
            b[to]=2;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});
          }
        }
        if(b[v]==2){
          if(a[to].F>a[v].F){
            b[to]=1;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});
          }
        }
        if(b[v]==3){
          if(a[to].F>a[v].F){
            b[to]=4;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});
          }
        }
        if(b[v]==4){
          if(a[to].F<a[v].F){
            b[to]=3;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});            
          }
        }
      }
    }
    for(auto to:vy[dy[v]]){
      if(to==v)continue;
      if(d[to]>abs(a[v].F-a[to].F)&&d[v]<abs(a[v].F-a[to].F)){
        if(b[v]==1){
          if(a[to].F>a[v].F){
            b[to]=4;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});            
          }
        }
        if(b[v]==2){
          if(a[to].F>a[v].F){
            b[to]=3;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});            
          }
        }
        if(b[v]==3){
          if(a[to].F<a[v].F){
            b[to]=2;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});    
          }
        }
        if(b[v]==4){
          if(a[to].F<a[v].F){
            b[to]=1;
            st.erase({d[to],to});
            d[to]=abs(a[v].F-a[to].F);
            st.in({d[to],to});     
          }
        }
      }    
    }
  }
  int cur=0;
  for(int i=1;i<=n;i++){
    cur+=(d[i]!=inf);
  }
  ans=max(ans,cur);
}

void solve(){
  cin>>n;
  set<int> d;
  map<int,int> mp;
  int cur=0;
  for(int i=1;i<=n;i++){
    cin>>a[i].F>>a[i].S;
    d.in(a[i].F+a[i].S);
  }
  for(int x:d)mp[x]=++cur;
  for(int i=1;i<=n;i++){
    dx[i]=mp[a[i].F+a[i].S];
    vx[mp[a[i].F+a[i].S]].pb(i);
  }

  cur=0;
  mp.clear();
  d.clear();

  for(int i=1;i<=n;i++){
    d.in(a[i].F-a[i].S);
  }
  for(int x:d)mp[x]=++cur;
  for(int i=1;i<=n;i++){
    dy[i]=mp[a[i].F-a[i].S];
    vy[mp[a[i].F-a[i].S]].pb(i);
  }

  for(int i=1;i<=4;i++){
    calc(1,i);
  }
  cout<<ans;
}
 
signed main(){
  //  freopen("help.in","r",stdin);
  //  freopen("help.out","w",stdout);
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  // prec();
  int t=1;
  // cin>>t;  
  while(t--)solve();
}

Compilation message (stderr)

fever.cpp:3: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    3 | #pragma optimize("Ofast")
      | 
fever.cpp:4: warning: ignoring '#pragma target ' [-Wunknown-pragmas]
    4 | #pragma target("avx2")
      |

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 0 / 12
• Subtask 6: 0 / 32
• Subtask 7: 0 / 31