Submission #783673

#	Time	Username	Problem	Language	Result	Execution time	Memory
783673		8pete8	Global Warming (CEOI18_glo)	C++14	100 / 100	48 ms	7632 KiB

glo

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
#define pb push_back
#define p push
#define pii pair<int,int>
#define ppii pair<int,pii>
#define fastio ios::sync_with_stdio(false);cin.tie(NULL);
#define set(x) memset(x,-1,sizeof(x));
#define int long long
const int mxn=1e9;
int n,x;
int32_t main(){
    fastio
    cin>>n>>x;
    vector<int>v(n);
    for(int i=0;i<n;i++)cin>>v[i];
    vector<int>lis,dp(n);
    for(int i=0;i<n;i++){
        int k;
        if(lis.empty()||lis.back()<v[i])lis.pb(v[i]),k=lis.size();
        else{
            auto it=lower_bound(lis.begin(),lis.end(),v[i]);
            (*it)=v[i];
            k=it-lis.begin()+1;
        }
        dp[i]=k;
    }
    vector<int>lis2;
    int ans=0;
    for(int i=n-1;i>=0;i--){
        int k;
        if(lis2.empty()||lis2.back()>v[i])k=lis2.size()+1;
        else{
            auto it=upper_bound(lis2.rbegin(),lis2.rend(),v[i]);
            k=lis2.rend()-it+1;
        }
        ans=max(ans,dp[i]+k-1);
        if(lis2.empty()||lis2.back()>v[i]+x)lis2.pb(v[i]+x);
        else{
            auto it=upper_bound(lis2.rbegin(),lis2.rend(),v[i]+x);
            it--;
            (*it)=v[i]+x;
        }
    }
    cout<<ans;
}

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