Submission #629957

#	Time	Username	Problem	Language	Result	Execution time	Memory
629957		NintsiChkhaidze	Global Warming (CEOI18_glo)	C++14	100 / 100	136 ms	5472 KiB

glo

#include <bits/stdc++.h>
#define ll long long
#define s second
#define pb push_back
#define f first
using namespace std;

const int N = 200005;
int a[N],l[N],r[N];
vector <int> vec;

signed main() {
    int n,x;
    cin>>n>>x;

    for (int i = 1; i <= n; i++) 
        vec.pb(1e9);

    for (int i = 1; i <= n; i++){
        cin>>a[i];
        int id = lower_bound(vec.begin(),vec.end(), a[i]) - vec.begin();
        vec[id] = a[i];
        l[i] = id + 1;
    }
    vec.clear();
    for (int i = 1; i <= n; i++) 
        vec.pb(1e9);

    for (int i = n; i >= 1; i--){
        int val = -(a[i] - x);
        int id = lower_bound(vec.begin(),vec.end(), val) - vec.begin();
        r[i] = id + 1;

        id = lower_bound(vec.begin(),vec.end(), -a[i]) - vec.begin();
        vec[id] = -a[i];
    }

    int ans=0;
    for (int i = 1; i <= n; i++)
        ans=max(ans,l[i] + r[i] - 1);
    cout<<ans<<"\n";
}

• 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