Submission #361648

#	Time	Username	Problem	Language	Result	Execution time	Memory
361648		iliccmarko	Global Warming (CEOI18_glo)	C++14	100 / 100	74 ms	7148 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl "\n"
#define INF 1000000000
#define LINF 1000000000000000LL
#define pb push_back
#define all(x) x.begin(), x.end()
#define len(s) (int)s.size()
#define test_case { int t; cin>>t; while(t--)solve(); }
#define single_case solve();
#define line cerr<<"----------"<<endl;
#define ios { ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); cerr.tie(NULL); }
#define mod 1000000007LL
const int N = 2e5 + 5;
ll a[N], dp[N], levo[N], desno[N];
ll n, x;



int main()
{
    ios
    cin>>n>>x;
    for(ll i = 0;i<n;i++) cin>>a[i];
    for(ll i = 0;i<N;i++) dp[i] = LINF;
    for(ll i = 0;i<n;i++)
    {
        ll pos = lower_bound(dp, dp+n+1, a[i]+x) - dp;
        levo[i] = pos-1;
        pos =  lower_bound(dp+1, dp+n+1, a[i]) - dp;
        //cout<<pos<<endl;
        dp[pos] = a[i];
    }
    for(int i = 0;i<N;i++) dp[i] = LINF;
    ll ans = 0;
    for(int i = n-1;i>=0;i--)
    {
        ll pos = lower_bound(dp+1, dp+n+1, -a[i]) - dp;
        dp[pos] = -a[i];
        //cout<<levo[i]<<" "<<pos<<endl;
        ans = max(ans, levo[i]+pos);
    }

    cout<<ans;





    return 0;
}

• 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