Submission #1096721

#	Time	Username	Problem	Language	Result	Execution time	Memory
1096721		Wewoo	Global Warming (CEOI18_glo)	C++17	37 / 100	231 ms	21664 KiB

glo

#include <bits/stdc++.h>
 
using namespace std;
 
const int N=(int) 2e5+9;
 
unordered_map <long long , long long > nen;
 
long long a[N],f[N],temp[N],f2[N];
long long st[4*N];
long long res,dp;
int n,x,idx,t;
 
void up(int id, int l, int r, int vt, int val) {
 
    if (l>vt || r<vt) return;
 
    if (l==r ) {
        st[id]=val;
        return;
    }
 
//    if (vt==2)
//    cout<<l<<" "<<r<<endl;
    int m=(l+r)/2;
 
    up(id*2,l,m,vt,val);
    up(id*2+1,m+1,r,vt,val);
 
    st[id]=max(st[id*2],st[id*2+1]);
 
}
 
long long get(int id, int l, int r, int u, int v) {
    if (l>v || r <u) return (int) 0;
 
    if (u<=l && r<=v) return st[id];
 
    int m=(l+r)/2;
 
    long long get1=get(id*2,l,m,u,v);
    long long get2=get(id*2+1,m+1,r,u,v);
 
//    if (u==2) {
//        cout<<l<<" "<<r<<endl;
//        cout<<get1<<" "<<get2<<endl;
//        cout<<endl;
//    }
 
    return max(get1,get2);
}
 
int small(int l, int r,long long x) {
    int vt=r;
 
    while (l<=r) {
        int m=(l+r)/2;
        if (temp[m]<=x) vt=m,r=m-1;
        else l=m+1;
    }
 
    return vt;
}
 
void solve() {
    res=idx;
    int pos=nen[a[n]];
    up(1,0,t,pos,f2[n]);
 
 
    for (int i=n-1; i>=1; i--) {
        int vt=upper_bound(temp+1,temp+1+n,a[i]-x)-temp;
        int pos=nen[temp[vt]];
        dp=get(1,0,t,pos,t);
        res=max(res,dp+f[i]);
        pos=nen[a[i]];
        up(1,0,t,pos,f2[i]);
    }
 
    cout<<res;
}
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
 
   // freopen("daydep.inp","r",stdin);
    //freopen("daydep.out","w",stdout);
 
    cin>>n>>x;
 
    for (int i=1; i<=n; i++)
        cin>>a[i];
 
    for (int i=1; i<=n; i++) {
        temp[idx+1]=(int) 1e12;
        int pos=lower_bound(temp+1,temp+idx+1,a[i])-temp;
        temp[pos]=a[i];
        idx=max(idx,pos);
        f[i]=pos;
    }
 
    for (int i=1; i<=n; i++) temp[i]=0;
    idx=0;
 
    for (int i=n; i>=1; i--) {
        temp[idx+1]=(int) -1e12;
        int pos=small(1,idx+1,a[i]);
        temp[pos]=a[i];
        idx=max(idx,pos);
        f2[i]=pos;
    }
 
    for (int i=1; i<=n; i++)
        temp[i]=a[i];
 
    sort(temp+1,temp+1+n);
 
    for (int i=1; i<=n; i++) {
        if (temp[i]!=temp[i-1]) t++;
        nen[temp[i]]=t;
    }
 
    solve();
    return 0;
}

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