Submission #734689

#	Time	Username	Problem	Language	Result	Execution time	Memory
734689		epicci23	Global Warming (CEOI18_glo)	C++17	47 / 100	1505 ms	63308 KiB

glo

#include "bits/stdc++.h"
#pragma optimize ("Bismillahirrahmanirrahim")
using namespace std;
#define pb push_back
#define ff first
#define ss second
#define endl "\n" 
#define int long long
#define double long double
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define what_is(x) cerr << #x << " is " << x << endl;
#define m (l+r)/2
constexpr int N=600005;
constexpr int MOD=1000000007;
constexpr int  INF2 = LLONG_MAX;
constexpr int INF=(int)1e18;
constexpr int LOG=30;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tp;
typedef priority_queue<pii,vector<pii>,greater<pii>> min_pq;
typedef priority_queue<pii> max_pq;
typedef long long ll;
//to think//
/*
 * graph approach
 * dp
 * dividing the problem to smaller statements
 * finding the real constraint
 * sqrt decomposition
 * greedy approach
 * pigeonhole principle
 * rewriting the problem/equality 
 * bitwise approaches
 * binary search if monotonic
 * divide and conquer
 * combinatorics
 * inclusion - exclusion
 * think like bfs
*/



inline int in()
{
  int x;cin >> x;
  return x;
}

inline string in2()
{
  string x;cin >> x;
  return x;
}


int seg[4*N];

void upd(int rt,int l,int r,int ind,int u)
{
  if(r<ind || l>ind) return;
  if(l==r)
  {
    seg[rt]=max(seg[rt],u);
    return;
  }
  upd(rt*2,l,m,ind,u);upd(rt*2+1,m+1,r,ind,u);
  seg[rt]=max(seg[rt*2],seg[rt*2+1]);
}

int query(int rt,int l,int r,int gl,int gr)
{
  if(l>r) return 0;
  if(l>gr || r<gl) return -INF;
  if(l>=gl && r<=gr) return seg[rt];
  return max(query(rt*2,l,m,gl,gr),query(rt*2+1,m+1,r,gl,gr));
}


void solve()
{
  int n=in(),k=in();
  int ar[n+1];
  int pre[n+1];
  int suf[n+1];
  map<int,int> mp;
  for(int i=1;i<=n;i++)
  {
    ar[i]=in();
    mp[ar[i]]=1;
    mp[ar[i]-k]=1;
    mp[ar[i]+k]=1;
  }
  int p=0;
  for(auto x:mp) mp[x.ff]=++p;
   
  for(int i=1;i<=n;i++)
  {
    pre[i]=query(1,1,p,1,mp[ar[i]]-1)+1;
    upd(1,1,p,mp[ar[i]],pre[i]);
  }

  int ans=query(1,1,p,1,p);
  memset(seg,0,sizeof(seg));
  for(int i=n;i>=1;i--)
  {
    suf[i]=query(1,1,p,mp[ar[i]]+1,p)+1;
    upd(1,1,p,mp[ar[i]],suf[i]);
  }
  
  memset(seg,0,sizeof(seg));

  for(int i=1;i<n;i++)
  {
    upd(1,1,p,mp[ar[i]],pre[i]);
    ans=max(ans,suf[i+1] + query(1,1,p,1,mp[ar[i+1]+k]-1));
    //what_is(ans);what_is(suf[i+1]);
  }
  memset(seg,0,sizeof(seg));

  for(int i=n;i>1;i--)
  {
    upd(1,1,p,mp[ar[i]],suf[i]);
    ans=max(ans,pre[i-1] + query(1,1,p,mp[ar[i-1]-k]+1,p));
  }

  cout << ans << endl;
}

int32_t main(){
   

     cin.tie(0); ios::sync_with_stdio(0);
     cout << fixed <<  setprecision(15);
   
   int t=1;//cin>> t;
 
 for(int i=1;i<=t;i++)
 {
  //  cout << "Case #" << i << ": ";
    solve();
 }
 
 return 0;
}

Compilation message (stderr)

glo.cpp:2: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    2 | #pragma optimize ("Bismillahirrahmanirrahim")
      |

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 0 / 25