Submission #133848

#	Time	Username	Problem	Language	Result	Execution time	Memory
133848		miguel	Global Warming (CEOI18_glo)	C++14	100 / 100	71 ms	7792 KiB

glo

#include<bits/stdc++.h>
using namespace std;
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define dbg(x) cout << #x << '=' << x << '\n';
#define ll long long
#define int ll
#define sz size()
#define x first
#define y second
#define pi pair <int, int>
#define pii pair <pi, pi>
#define vi vector <int>
const ll nmax=5e4+2;
const ll mod = 998244353;
int n, x, s[200001], a[200001];
vector <int> dp;

int32_t main(){
    ios_base :: sync_with_stdio(0); cin.tie(); cout.tie();
    cin>>n>>x;
    //dp.pb(0);
    for(int i=1; i<=n; i++){
        cin>>a[i];
        auto it=lower_bound(dp.begin(), dp.end(), a[i]);
        if(it==dp.end()){
            dp.pb(a[i]);
            s[i]=dp.size();
        }
        else{
            dp[it-dp.begin()]=a[i];
            s[i]=it-dp.begin()+1;
        }
    }
   // for(int i: dp) cout<<i<<" "; cout<<endl;
    //for(int i=1; i<=n; i++) cout<<s[i]<<" ";
    int ans=dp.size();
    vi lsd;
    for(int i=n; i>=1; --i){
        auto it=lower_bound(lsd.begin(), lsd.end(), -a[i]);
        if(it==lsd.end()) ans=max(ans, s[i]+(int)lsd.size());
        else ans=max(ans, s[i]+(it-lsd.begin()));

        auto it1=lower_bound(lsd.begin(), lsd.end(), -a[i]-x);
        if(it1==lsd.end()) lsd.pb(-a[i]-x);
        else lsd[it1-lsd.begin()]=-a[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