Submission #284401

#	Time	Username	Problem	Language	Result	Execution time	Memory
284401		Revo7	Global Warming (CEOI18_glo)	C++14	58 / 100	1284 ms	44280 KiB

glo

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define left 2*i+1
#define righ 2*i+2
#define mid (l+r)/2
#define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);


using namespace std;
const ll maxn=2e5+100;
const ll inf=1e9+10;
const ll mod=1e9+7;
const ll base=27;

ll n,k,ans;
ll b[maxn],a[maxn],pre[maxn],suf[maxn];
map<ll,ll>ha;
vector<ll>st;

ll qur(ll i,ll l,ll r,ll ql,ll qr){
    if(ql>qr)return 0;
    if(r<ql||l>qr)return 0;
    if(l>=ql&&r<=qr)return st[i];
    return max(qur(left,l,mid,ql,qr),qur(righ,mid+1,r,ql,qr));
}

void upd(ll i,ll l,ll r,ll id,ll val){
    if(r<id||l>id)return;
    if(l==r){
        st[i]=max(st[i],val);
        return;
    }
    upd(left,l,mid,id,val);
    upd(righ,mid+1,r,id,val);
    st[i]=max(st[left],st[righ]);
}

int main()
{
    cin>>n>>k;
    for(ll i=0;i<n;i++){
        cin>>a[i];
        ha[a[i]]=1;
        ha[a[i]-k]=1;
    }

    ll cnt=0;
    for(auto &x:ha){
        x.second=cnt++;
    }

    st.assign(4*cnt+10,0);
    for(ll i=0;i<n;i++){
        b[i]=ha[a[i]];
        pre[i]=1+qur(0,0,cnt-1,0,b[i]-1);
        upd(0,0,cnt-1,b[i],pre[i]);
        ans=max(ans,pre[i]);
    }
    //for(ll i=0;i<n;i++)cout<<pre[i]<<' ';cout<<endl;

    st.assign(4*maxn+10,0);
    for(ll i=n-1;i>=0;i--){
        suf[i]=1+qur(0,0,cnt-1,b[i]+1,cnt-1);
        upd(0,0,cnt-1,b[i],suf[i]);
        if(i){
            ll cur=pre[i-1]+qur(0,0,cnt-1,ha[a[i-1]-k]+1,cnt-1);
            ans=max(ans,cur);
            //if(cur==6)cout<<i<<endl;
        }
    }

    //for(ll i=0;i<n;i++)cout<<suf[i]<<' ';cout<<endl;
    cout<<ans<<endl;
    return 0;
}

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