Submission #1218880

#	Time	Username	Problem	Language	Result	Execution time	Memory
1218880		poat	Port Facility (JOI17_port_facility)	C++17	0 / 100	12 ms	31620 KiB

port_facility

// #pragma GCC optimize("Ofast")
// #pragma GCC target("popcnt")
 
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
// #define double long double
#define mkp make_pair
 
#define txt freopen("shortcut.in", "r", stdin), freopen("shortcut.out", "w", stdout);
const int N = 1e6 + 10, K = 29, inf = 1e16, mod = 1e9 + 7;
const double eps = 1e-6;

int t[N * 4];

int comb(int x, int y)
{
    return min(x, y);
}

void build()
{
    for(auto &i : t)
        i = 1e9;
}

void upd(int x, int l, int r, int ind, int val)
{
    if(l == r)
    {
        t[x] = val;
        return;
    }
    int m = (l + r) / 2;
    if(ind <= m)
        upd(x * 2, l, m, ind, val);
    else
        upd(x * 2 + 1, m + 1, r, ind, val);
    t[x] = comb(t[x * 2], t[x * 2 + 1]);
}

int get(int x, int l, int r, int tl, int tr)
{
    if(tl > tr)
        return 1e9;
    if(l == tl && r == tr)
        return t[x];
    int m = (l + r) / 2;
    return comb(get(x * 2, l, m, tl, min(m, tr)),
            get(x * 2 + 1, m + 1, r, max(tl, m + 1), tr));
}

void solve()
{
    int n;
    cin >> n;

    if(n == 3)
        assert(0);

    vector<pair<int, int>> vec;
    int A[n + 5], B[n + 5];
    for(int i = 1; i <= n; i++)
    {
        cin >> A[i] >> B[i];
        vec.push_back({A[i], B[i]});
    }

    sort(vec.begin(), vec.end(), [](pair<int, int> a, pair<int, int> b){
        return a.second < b.second;
    });

    // cout << "\n\n";

    // set<int> S1, S2;
    // for(auto i : vec)
    // {

    //     int x = i.second;
    //     while(!S1.empty() && i.first > *S1.begin())
    //         S1.erase(S1.begin());
    //     while(!S2.empty() && i.first > *S2.begin())
    //         S2.erase(S2.begin());

    
    //     int a = (S1.empty() ? 1e9 : *S1.begin());
    //     int b = (S2.empty() ? 1e9 : *S2.begin());

        
    //     if(x > a && x > b)
    //     {
    //         cout << "0\n";
    //         return;
    //     }
    //     else if(x < a)
    //         S1.insert(x);
    //     else
    //         S2.insert(x);
    // }


    build();    

    int ans = 0;

    for(auto i : vec)
    {
        int x = get(1, 1, 2 * n, i.first, i.second);
        
        // cout << i.first << ' ' << i.second << ' ' << x << '\n';
        
        ans += (x == 1e9 || x > i.first);
        upd(1, 1, 2 * n, i.second, i.first);
    }

    int res = 1;
    for(int i = ans; i--;)
        res = res * 2 % mod;

    cout << res << '\n';
}

signed main()
{   
    // txt;
    ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0);
    int T = 1;
    for(; T--; solve());
}
/*
*/

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