Submission #1185208

#	Time	Username	Problem	Language	Result	Execution time	Memory
1185208		Zbyszek99	Gift Exchange (JOI24_ho_t4)	C++20	100 / 100	1008 ms	35056 KiB

Main

#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 query
{
    int l,r,ind;
    bool operator<(const query& other) const
    {
        return r < other.r;
    }
};

const int tree_siz = 1024*2048-1;
int drzewo1[tree_siz+1];

int get_max1(int akt, int p1, int p2, int s1, int s2)
{
    if(p2 < s1 || p1 > s2) return -1e9;
    if(p1 >= s1 && p2 <= s2) return drzewo1[akt];
    return max(get_max1(akt*2,p1,(p1+p2)/2,s1,s2),get_max1(akt*2+1,(p1+p2)/2+1,p2,s1,s2));
}

void upd1(int v)
{
    drzewo1[v] = max(drzewo1[v*2],drzewo1[v*2+1]);
    if(v != 1) upd1(v/2);
}

void change1(int ind, int v)
{
    drzewo1[tree_siz/2+ind+1] = v;
    upd1((tree_siz/2+1+ind)/2);
}

int drzewo2[tree_siz+1];

void set_max2(int akt, int p1, int p2, int s1, int s2, int w)
{
    if(p2 < s1 || p1 > s2) return;
    if(p1 >= s1 && p2 <= s2)
    {
        drzewo2[akt] = max(drzewo2[akt],w);
        return;
    }
    set_max2(akt*2,p1,(p1+p2)/2,s1,s2,w);
    set_max2(akt*2+1,(p1+p2)/2+1,p2,s1,s2,w);
}

int get_max2(int v)
{
    return max(drzewo2[v],(v != 1 ? get_max2(v/2) : 0)); 
}

int A[500'001];
int B[500'001];
int nxt_ok[500'001][2];

void calc_nxt(int n, int type)
{
    rep2(i,1,tree_siz)
    {
        drzewo1[i] = 0;
        drzewo2[i] = 0;
    }
    rep2(i,1,n)
    {
        int prv = max(get_max2(tree_siz/2+1+A[i]),get_max1(1,0,tree_siz/2,B[i],A[i]));
        if(type == 0) nxt_ok[i][0] = prv;
        else nxt_ok[n-i+1][1] = n-prv+1;
        change1(A[i],i);
        set_max2(1,0,tree_siz/2,B[i],A[i],i);
    }
}

bool query_ans[200'001];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    int n;
    cin >> n;
    rep2(i,1,n) cin >> A[i];
    rep2(i,1,n) cin >> B[i];
    calc_nxt(n,0);
    reverse(A+1,A+n+1);
    reverse(B+1,B+n+1);
    calc_nxt(n,1);
    reverse(A+1,A+n+1);
    reverse(B+1,B+n+1);
    rep2(i,1,tree_siz) drzewo1[i] = 0;
    vector<pii> events;
    rep2(i,1,n)
    {
        events.pb({nxt_ok[i][1],i});
    }
    sort(all(events));
    rep2(i,1,n) change1(i,-nxt_ok[i][0]);
    vector<query> queries;
    int q;
    cin >> q;
    rep(qq,q)
    {
        int l,r;
        cin >> l >> r;
        queries.pb({l,r,qq});
    }
    sort(all(queries));
    int cur_e = 0;
    forall(it,queries)
    {
        while(cur_e < siz(events) && events[cur_e].ff <= it.r)
        {
            change1(events[cur_e].ss,-1e9);
            cur_e++;
        }
        query_ans[it.ind] = (-get_max1(1,0,tree_siz/2,it.l,it.r) >= it.l);
    }
    rep(qq,q)
    {
        if(query_ans[qq]) cout << "Yes\n";
        else cout << "No\n";
    }
}

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 10 / 10
• Subtask 4: 31 / 31
• Subtask 5: 8 / 8
• Subtask 6: 12 / 12
• Subtask 7: 18 / 18
• Subtask 8: 12 / 12