Submission #1197463

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197463		og_matveychick1	Port Facility (JOI17_port_facility)	C++20	78 / 100	1839 ms	1114112 KiB

port_facility

#include "bits/stdc++.h"

using namespace std;

typedef int ll;
typedef pair<ll, ll> pll;
typedef vector<ll> vll;

const ll N = 1 << 20, mod = 1e9 + 7;

struct node {
    ll f1, f2, o1, o2;
    set<ll> s;

    node() : f1(-1), f2(-1), o1(1e9), o2(1e9) {}
};

ll n, l[N], r[N], c[N], p[N], id[2 * N], ans = 1, rr[2 * N];
node t[4 * N];
queue<ll> q;

void build(ll v, ll l1, ll r1) {
    if (l1 + 1 == r1) {
        if (id[l1] != -1) {
            t[v].s.insert(r[id[l1]]);
        }
        return;
    }
    ll m = (l1 + r1) / 2;
    build(v * 2, l1, m), build(v * 2 + 1, m, r1);
    for (auto x: t[v * 2].s) t[v].s.insert(x);
    for (auto x: t[v * 2 + 1].s) t[v].s.insert(x);
}

void build() {
    build(1, 0, 2 * N);
}

void add3(ll v, ll l1, ll r1, ll L, ll R, ll x, ll i) {
    if (l1 >= L || r1 <= 0) return;
    if (l1 >= 0 && r1 <= L) {
        auto it = t[v].s.lower_bound(L);
        while (it != t[v].s.end() && *it < R) {
            if (!c[rr[*it]]) c[rr[*it]] = x, q.push(rr[*it]);
            t[v].s.erase(it);
            it = t[v].s.lower_bound(L);
        }
        return;
    }
    ll m = (l1 + r1) / 2;
    add3(v * 2, l1, m, L, R, x, i);
    add3(v * 2 + 1, m, r1, L, R, x, i);
}

void add3(ll l1, ll r1, ll x, ll i) {
    add3(1, 0, 2 * N, l1, r1, x, i);
}

void add4(ll v, ll l1, ll r1, ll L, ll R, ll x) {
    if (l1 > L || r1 <= L) return;
    if (x == 1) t[v].f1 = max(t[v].f1, R);
    else t[v].f2 = max(t[v].f2, R);
    if (l1 + 1 == r1) return;
    ll m = (l1 + r1) / 2;
    add4(v * 2, l1, m, L, R, x);
    add4(v * 2 + 1, m, r1, L, R, x);
}

void add4(ll L, ll R, ll x) {
    add4(1, 0, 2 * N, L, R, x);
}

void add1(ll v, ll l1, ll r1, ll L, ll R, ll x, ll i) {
    if (l1 >= R || r1 <= L) return;
    if (l1 >= L && r1 <= R) {
        while (t[v].s.size() && (*--t[v].s.end()) > R) {
            if (!c[rr[(*--t[v].s.end())]]) c[rr[(*--t[v].s.end())]] = x, q.push(rr[(*--t[v].s.end())]);
            t[v].s.erase(--t[v].s.end());
        }
        return;
    }
    ll m = (l1 + r1) / 2;
    add1(v * 2, l1, m, L, R, x, i);
    add1(v * 2 + 1, m, r1, L, R, x, i);
}

void add1(ll l1, ll r1, ll x, ll i) {
    add1(1, 0, 2 * N, l1, r1, x, i);
}

void add2(ll v, ll l1, ll r1, ll L, ll R, ll x) {
    if (l1 >= R || r1 <= L) return;
    if (l1 >= L && r1 <= R) {
        if (x == 1) t[v].o1 = min(t[v].o1, R);
        else t[v].o2 = min(t[v].o2, R);
        return;
    }
    ll m = (l1 + r1) / 2;
    add2(v * 2, l1, m, L, R, x);
    add2(v * 2 + 1, m, r1, L, R, x);
}

void add2(ll l1, ll r1, ll x) {
    add2(1, 0, 2 * N, l1, r1, x);
}

bool check(ll v, ll l1, ll r1) {
    if (t[v].o1 < t[v].f2) {
        return 0;
    }
    if (t[v].o2 < t[v].f1) {
        return 0;
    }
    if (l1 + 1 == r1) return 1;
    ll m = (l1 + r1) / 2;
    return check(v * 2, l1, m) & check(v * 2 + 1, m, r1);
}

bool check() {
    return check(1, 0, 2 * N);
}

signed main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    cin >> n;
    memset(id, -1, sizeof id);
    for (ll i = 0; i < n; i++) cin >> l[i] >> r[i], id[l[i]] = i, rr[r[i]] = i;
    build();
    iota(p, p + n, 0);
    sort(p, p + n, [&](ll x, ll y) { return l[x] < l[y]; });
    for (ll _ = 0; _ < n; _++) {
        if (q.size()) {
            ll i = q.front();
            q.pop();
            add1(l[i], r[i], 3 - c[i], i);
            add3(l[i], r[i], 3 - c[i], i);
            add4(l[i], r[i], c[i]);
            _--;
        } else {
            ll i = p[_];
            if (c[i]) continue;
            ans = (ans * 2) % mod;
            c[i] = 1;
            add1(l[i], r[i], 3 - c[i], i);
            add3(l[i], r[i], 3 - c[i], i);
            add4(l[i], r[i], c[i]);
        }
    }
    sort(p, p + n, [&](ll x, ll y) { return r[x] < r[y]; });
    for (ll _ = 0; _ < n; _++) {
        ll i = p[_];
        add2(l[i], r[i], 3 - c[i]);
    }
//    for (ll i = 0; i < n; i++) ans = (ans * (1 + (find_set(i) == i))) % mod;
    ans *= check();
    cout << ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 56 / 56
• Subtask 4: 0 / 22