Submission #856478

#	Time	Username	Problem	Language	Result	Execution time	Memory
856478		ArminAzimi	trapezoid (balkan11_trapezoid)	C++14	40 / 100	128 ms	11964 KiB

trapezoid

#include<bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds; 
#define ordered_set tree<pair <int, int>, null_type,less<pair <int, int>>, rb_tree_tag,tree_order_statistics_node_update> 

const int MAXN = 2e5 + 10, MAXM = 1e2 + 10, MOD = 998244353, MOD1 = 1e9 + 9, SQ = 350;
const long long INF = 1e9 + 11;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int a[MAXN], b[MAXN], c[MAXN], d[MAXN];
int id_a[MAXN], id_b[MAXN];
int seg[4 * MAXN];
int dp[MAXN];

void upd(int l, int r, int id, int ind, int val) {
    if (l == r) {
        seg[id] = val;
        return;
    }

    int mid = (l + r) / 2;
    if (ind <= mid)
        upd(l, mid, 2 * id, ind, val);
    else
        upd(mid + 1, r, 2 * id + 1, ind, val);

    seg[id] = max(seg[2 * id], seg[2 * id + 1]);
}

int get(int l, int r, int id, int l1, int r1) {
    if (r < l1 || r1 < l)
        return 0;
    if (l1 <= l && r <= r1)
        return seg[id];
    
    int mid = (l + r) / 2;
    return max(get(l, mid, 2 * id, l1, r1), get(mid + 1, r, 2 * id + 1, l1, r1));
}


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

    vector <int> kol1, kol2;
    for (int i = 1; i <= n; i++) {
        cin >> a[i] >> b[i] >> c[i] >> d[i];
        kol1.push_back(a[i]);
        kol1.push_back(b[i]);
        kol2.push_back(c[i]);
        kol2.push_back(d[i]);
    }

    sort(kol1.begin(), kol1.end());
    kol1.resize(unique(kol1.begin(), kol1.end()) - kol1.begin());

    sort(kol2.begin(), kol2.end());
    kol2.resize(unique(kol2.begin(), kol2.end()) - kol2.begin());

    for (int i = 1; i <= n; i++) {
        a[i] = lower_bound(kol1.begin(), kol1.end(), a[i]) - kol1.begin();
        b[i] = lower_bound(kol1.begin(), kol1.end(), b[i]) - kol1.begin();
        c[i] = lower_bound(kol2.begin(), kol2.end(), c[i]) - kol2.begin();
        d[i] = lower_bound(kol2.begin(), kol2.end(), d[i]) - kol2.begin();

        id_a[a[i]] = i;
        id_b[b[i]] = i;
    }

    for (int i = 0; i < 2 * n; i++) {
        if (id_a[i]) {
            int ind = id_a[i];
            int l1 = c[ind];

            dp[i] = get(0, 2 * n, 1, 0, l1) + 1;    
        }
        else {
            int ind = id_b[i];
            int index = d[ind];

            upd(0, 2 * n, 1, index, dp[a[ind]]);
        }
    }
    
    int ans = 0;
    for (int i = 0; i < 2 * n; i++)
        ans = max(ans, dp[i]);

    cout << ans << " 0" << "\n";
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int q = 1;
    // cin >> q;
    
    while (q--) {
        solve();
    }
}

• Subtask 1: 40 / 100