Submission #1049061

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049061		matere	Global Warming (CEOI18_glo)	C++14	62 / 100	63 ms	8236 KiB

glo

#include<bits/stdc++.h>
using namespace std;
pair<long long,long long>step[200005];
long long a[200005],d[200005],dc[200005],ls;
int main(){
    long long n,x;
    cin>>n>>x;
    d[0]=-4e9;
    for(long long i=1;i<=n;i++) d[i]=4e9;
    for(long long i=1;i<=n;i++){
        cin>>a[i];
        long long l=0,r=n+1;
        while(l+1<r){
            long long mid=(l+r)/2;
            if(d[mid]<a[i]) l=mid;
            else r=mid;
        }
        l++;
        if(d[l]>a[i]){
            step[i]={l,d[l]};
            d[l]=a[i];
            ls=max(ls,l);
        }
    }
    d[n+1]=4e9;
    long long ans=ls;
    dc[0]=4e9;
    for(long long i=1;i<=n;i++) dc[i]=-4e9;
    for(long long i=n;i>=1;i--){
        if(step[i].first!=0){
            d[step[i].first]=step[i].second;
            if(d[step[i].first]==4e9) ls--;
        }   
        a[i]+=x;
        long long l=0,r=n+1;
        while(l+1<r){
            long long mid=(l+r)/2;
            if(dc[mid]>a[i]) l=mid;
            else r=mid;
        }
        l++;
        if(dc[l]<a[i]){
            dc[l]=a[i];
        }
        l=0,r=n+1;
        while(l+1<r){
            long long mid=(l+r)/2;
            if(dc[mid]>d[ls]) l=mid;
            else r=mid;
        }
        ans=max(ans,ls+l);
    }
    cout<<ans<<endl;
}

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