Submission #1306148

#	Time	Username	Problem	Language	Result	Execution time	Memory
1306148		Zbyszek99	Event Hopping 2 (JOI21_event2)	C++20	100 / 100	212 ms	26744 KiB

event2

#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;

const int tree_siz = 1024*512-1;
pii min_[tree_siz+1];

pii get_min(int akt, int p1, int p2, int s1, int s2)
{
    if(p2 < s1 || p1 > s2) return {1e9,1e9};
    if(p1 >= s1 && p2 <= s2) return min_[akt];
    return min(get_min(akt*2,p1,(p1+p2)/2,s1,s2),get_min(akt*2+1,(p1+p2)/2+1,p2,s1,s2));
}

void upd(int v)
{
    min_[v] = min(min_[v*2],min_[v*2+1]);
    if(v != 1) upd(v/2);
}

void change(int ind, pii x)
{
    min_[tree_siz/2+1+ind] = min(min_[tree_siz/2+1+ind],x);
    upd((tree_siz/2+1+ind)/2);
}

pii seg[100003];
int jump[100003][17];
int n,k;

int count_jumps(int ind, int p)
{
    int ans = 0;
    for(int bit = 16; bit >= 0; bit--)
    {
        int ind2 = jump[ind][bit];
        if(seg[ind2].ss <= p)
        {
            ind = ind2;
            ans += (1<<bit);
        }
    }
    return ans;
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    cin >> n >> k;
    rep(i,n) cin >> seg[i].ff >> seg[i].ss;
    map<int,int> m;
    rep(i,n)
    {
        m[seg[i].ff] = 1;
        m[seg[i].ss] = 1;
    }
    int cur = 2;
    forall(it,m) m[it.ff] = cur++;
    rep(i,n)
    {
        seg[i].ff = m[seg[i].ff];
        seg[i].ss = m[seg[i].ss];
    }
    seg[n] = {cur,cur+2};
    seg[n+1] = {0,1};
    rep(i,tree_siz+1) min_[i] = {1e9,n};
    rep(i,n+2) change(seg[i].ff,{seg[i].ss,i});
    jump[n][0] = n;
    rep(i,n+2) if(i != n) jump[i][0] = get_min(1,0,tree_siz/2,seg[i].ss,cur).ss; 
    rep2(bit,1,16) rep(i,n+2) jump[i][bit] = jump[jump[i][bit-1]][bit-1];
    ll cur_ans = count_jumps(n+1,cur);
    if(cur_ans < k)
    {
        cout << "-1\n";
        return 0;
    }
    set<pii> ans = {{0,n+1},{cur,n}};
    rep(i,n)
    {
        auto ptr = ans.lower_bound({seg[i].ff,-1});
        int nxt_seg = (*ptr).ss;
        int prv_seg = (*--ptr).ss;
        int new_ans = cur_ans-count_jumps(prv_seg,seg[nxt_seg].ff)+1+count_jumps(prv_seg,seg[i].ff)+count_jumps(i,seg[nxt_seg].ff);
        if(new_ans >= k && seg[prv_seg].ss <= seg[i].ff && seg[nxt_seg].ff >= seg[i].ss)
        {
            cur_ans = new_ans;
            ans.insert({seg[i].ff,i});
        }
    }
    vi ans2;
    forall(it,ans) ans2.pb(it.ss);
    sort(all(ans2));
    rep(i,k) cout << ans2[i]+1 << "\n";
}

• Subtask 1: 7 / 7
• Subtask 2: 1 / 1
• Subtask 3: 31 / 31
• Subtask 4: 61 / 61