Submission #1083593

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083593		knot222	Commuter Pass (JOI18_commuter_pass)	C++14	0 / 100	31 ms	5980 KiB

commuter_pass

#include <bits/stdc++.h>
#include <iostream>
using namespace std;
#define ll long long int
const ll inf = 4e18;
int main()
{
    ll N,X;
    cin>>N>>X;
    vector<ll> a(N+10);
    vector<ll> b(N+10);
    for (int i=1;i<=N;i++) {
        cin>>a[i];
        b[N+1-i] = -a[i];
    }
    vector<ll> l1(N+10, inf);
    vector<ll> ll1(N+10,inf);
    l1[0] = -inf;
    for (int i=1;i<=N;i++) {
        int l = lower_bound(l1.begin()+1, l1.end(), a[i]) - (l1.begin());
        if (l1[l-1] < a[i] && a[i] < l1[l]) {
            l1[l] = a[i];
        }
        ll1[i] = l;
    }
    vector<ll> l2(N+10, inf);
    vector<ll> ll2(N+10,inf);
    l2[0] = -inf;
    for (int i=1;i<=N;i++) {
        int tt = lower_bound(l2.begin()+1, l2.end(), (b[i]+X)) - l2.begin();
        int l = lower_bound(l2.begin()+1, l2.end(), b[i]) - (l2.begin());
        if (l2[l-1] < b[i] && b[i] < l2[l]) {
            l2[l] = b[i];
        }
        ll2[N+1-i] = tt-1;
    }
    ll ans = 1;
    for (int i=1;i<N;i++) {
        ans = max(ll1[i]+ll2[i], ans);
    }
    cout << ans;
    return 0;
}
/*
8 10
7 3 5 12 2 7 3 4 
*/

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45