Submission #743515

#	Time	Username	Problem	Language	Result	Execution time	Memory
743515		GrindMachine	Event Hopping 2 (JOI21_event2)	C++17	32 / 100	3058 ms	15116 KiB

event2

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

template<typename T>
struct segtree {
    // https://codeforces.com/blog/entry/18051

    /*=======================================================*/

    struct data {
        ll a;
    };

    data neutral = {0};

    data merge(data &left, data &right) {
        data curr;
        curr.a = max(left.a, right.a);
        return curr;
    }

    void create(int i, T v) {
        amax(tr[i].a, v);
    }

    void modify(int i, T v) {
        amax(tr[i].a, v);
    }

    /*=======================================================*/

    int n;
    vector<data> tr;

    segtree() {

    }

    segtree(int siz) {
        init(siz);
    }

    void init(int siz) {
        n = siz;
        tr.assign(2 * n, neutral);
    }

    void build(vector<T> &a, int siz) {
        rep(i, siz) create(i + n, a[i]);
        rev(i, n - 1, 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    void pupd(int i, T v) {
        modify(i + n, v);
        for (i = (i + n) >> 1; i; i >>= 1) tr[i] = merge(tr[i << 1], tr[i << 1 | 1]);
    }

    data query(int l, int r) {
        data resl = neutral, resr = neutral;

        for (l += n, r += n; l <= r; l >>= 1, r >>= 1) {
            if (l & 1) resl = merge(resl, tr[l++]);
            if (!(r & 1)) resr = merge(tr[r--], resr);
        }

        return merge(resl, resr);
    }
};

void solve(int test_case)
{
    ll n, k; cin >> n >> k;
    vector<pll> a(n + 5);
    rep1(i, n) cin >> a[i].ff >> a[i].ss;

    vector<ll> b;
    rep1(i, n) {
        b.pb(a[i].ff);
        b.pb(a[i].ss);
    }

    sort(all(b));
    b.resize(unique(all(b)) - b.begin());
    ll siz = sz(b);

    rep1(i, n) {
        a[i].ff = lower_bound(all(b), a[i].ff) - b.begin();
        a[i].ss = lower_bound(all(b), a[i].ss) - b.begin();
    }

    vector<pll> order;
    rep1(i, n) order.pb({a[i].ff, i});

    sort(all(order));
    vector<bool> rem(n + 5);

    vector<ll> ans;

    rep1(guy, n) {
        if (k == 0) break;
        if (rem[guy]) conts;

        vector<ll> dp_pref(n + 5), dp_suff(n + 5);
        segtree<ll> st(siz + 5);

        rep(id, n) {
            ll i = order[id].ss;
            if (rem[i]) conts;

            auto [l, r] = a[i];
            dp_pref[i] = st.query(0, l).a + 1;
            st.pupd(r, dp_pref[i]);
        }

        st = segtree<ll>(siz + 5);

        rev(id, n - 1, 0) {
            ll i = order[id].ss;
            if (rem[i]) conts;

            auto [l, r] = a[i];
            dp_suff[i] = st.query(r, siz - 1).a + 1;
            st.pupd(l, dp_suff[i]);
        }

        ll mx_pick = dp_pref[guy] + dp_suff[guy] - 1;

        if (mx_pick >= k) {
            ans.pb(guy);
            rem[guy] = 1;
            k--;

            rep1(i, n) {
                if (rem[i]) conts;
                auto [l1, r1] = a[i];
                auto [l2, r2] = a[guy];
                if (!(min(r1, r2) <= max(l1, l2))) {
                    rem[i] = 1;
                }
            }
        }
    }

    if (ans.empty()) {
        cout << -1 << endl;
        return;
    }

    trav(x, ans) cout << x << endl;
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

• Subtask 1: 0 / 7
• Subtask 2: 1 / 1
• Subtask 3: 31 / 31
• Subtask 4: 0 / 61