Submission #1136101

#	Time	Username	Problem	Language	Result	Execution time	Memory
1136101		Zbyszek99	Global Warming (CEOI18_glo)	C++20	100 / 100	1439 ms	51320 KiB

glo

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

struct node
{
    int l = 0;
    int r = 262'144-1;
    node* left;
    node* right;
    int max_val = 0;
    bool is_left = false;
    bool is_right = false;
    void uleft()
    {
        if(!is_left)
        {
            left = new node;
            left -> l = l;
            left -> r = (l+r)/2;
        }
        is_left = true;
    }
    void uright()
    {
        if(!is_right)
        {
            right = new node;
            right -> l = (l+r)/2+1;
            right -> r = r;
        }
        is_right = true;
    }
    int get_max(int p1, int p2)
    {
        if(p1 > p2) return 0;
        if(r < p1 || l > p2) return 0;
        if(l >= p1 && r <= p2) return max_val;
        if(p1 <= (l+r)/2)
        {
            uleft();
        }
        if(p2 >= (l+r)/2+1)
        {
            uright();
        }
        return max((is_left ? left->get_max(p1,p2) : 0),(is_right ? right->get_max(p1,p2) : 0));
    }
    void upd_max(int p, int val)
    {
        if(l == r)
        {
            if(val == -1)
            {
                max_val = 0;
            }
            max_val = max(max_val,val);
            return;
        }
        if(p <= (l+r)/2)
        {
            uleft();
            left -> upd_max(p,val);
        }
        else
        {
            uright();
            right -> upd_max(p,val);
        }
        max_val = 0;
        if(is_left)
        {
            max_val = max(max_val,left -> max_val);
        }
        if(is_right)
        {
            max_val = max(max_val,right -> max_val);
        }
    }
};

ll arr[200'001];
int sort_arr[200'001];
map<int,int> pom;
int max_pref[200'001];
int max_suf[200'001];
node tree_;
set<int> set_arr;

int get_max(int l, int r)
{
    auto itl = set_arr.lower_bound(l);
    auto itr = set_arr.upper_bound(r);
    if(itl != set_arr.end())
    {
        l = pom[*itl];
    }
    else
    {
        l = 200'000;
    }
    if(itr != set_arr.end())
    {
        itr--;
        r = pom[*itr];
    }
    else
    {
        r = 200'000;
    }
    return tree_.get_max(l,r);
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    int n;
    ll x;
    cin >> n >> x; 
    rep(i,n) cin >> arr[i];

    rep(i,n)
    {
        set_arr.insert(arr[i]);
    }
    set_arr.insert(0);
    map<int,int> m;
    rep(i,n) m[arr[i]] = 1;

    int cur = 1;
    forall(it,m)
    {
        pom[it.ff] = cur++;
    }
    rep(i,n) sort_arr[i] = pom[arr[i]];
    rep(i,n)
    {
        int val = get_max(0,arr[i]-1)+1;
        max_pref[i] = val;
        tree_.upd_max(sort_arr[i],val);
    }
    rep(i,n) tree_.upd_max(sort_arr[i],-1);
    for(int i = n-1; i >= 0; i--)
    {
        int val = get_max(arr[i]+1,1e9)+1;
        max_suf[i] = val;
        tree_.upd_max(sort_arr[i],val);
    }
    rep(i,n) tree_.upd_max(sort_arr[i],-1);
    int ans = 0;
    for(int i = n-1; i >= 0; i--)
    {
        ans = max(ans,max_pref[i] + get_max(max(0LL,arr[i]-x+1),1e9+1));
        tree_.upd_max(sort_arr[i],max_suf[i]);
    }
    rep(i,n) tree_.upd_max(sort_arr[i],-1);
    rep(i,n)
    {
        ans = max(ans,max_suf[i] + get_max(0,max(0LL,arr[i]-x-1)));
        tree_.upd_max(sort_arr[i],max_pref[i]);
    }
    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