Submission #1199782

#	Time	Username	Problem	Language	Result	Execution time	Memory
1199782		ofoz	Curtains (NOI23_curtains)	C++20	0 / 100	0 ms	328 KiB

curtains

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define vi vector<int>
#define pi pair<int, int>
#define ppi pair<pair<int, int>, int>
vector<int> tree;
vector<bool> lazy;

void push(int v) {
    if (!lazy[v]) return;
    lazy[v] = 0;
    if (tree[v] < tree[2*v]) {
        lazy[2*v] = 1;
        tree[2*v] = tree[v];
    }
    if (tree[v] < tree[2*v+1]) {
        lazy[2*v+1] = 1;
        tree[2*v+1] = tree[v];
    }
}

void update(int v, int tl, int tr, int l, int r, int x) {
    if (l > r) return;
    if (tl == l && tr == r) {
        if (x >= tree[v]) return;
        tree[v] = x;
        lazy[v] = 1;

        return;
    }
    int tm = (tl+tr)/2;
    update(2*v, tl, tm, l, min(r, tm), x);
    update(2*v+1, tm+1, tr, max(l, tm+1), r, x);
    tree[v] = max(tree[2*v], tree[2*v+1]);
    
}

int query(int v, int tl, int tr, int l, int r) {
    if (l > r) return INT32_MIN;
    if (tl == l && tr == r) return tree[v];
    push(v);
    int tm = (tl+tr)/2;
    int a = query(2*v, tl, tm, l, min(r, tm));
    int b = query(2*v+1, tm+1, tr, max(l, tm+1), r);
    return max(a, b);
}

void solve() {
    int n, m, q;
    cin >> n >> m >> q;
    tree.resize(4*n, INT32_MAX);
    lazy.resize(4*n, false);
    vector<pair<int, int>> seg;
    for (int i = 0; i < m; ++i) {
        int a, b;
        cin >> a >> b;
        --a; --b;
        seg.push_back({a, b});
    }
    sort(seg.begin(), seg.end());

    vector<int> mn(n, INT32_MAX);
    vector<ppi> queries;
    for (int i = 0; i < q; ++i) {
        int a, b;
        cin >> a >> b;
        --a; --b;
        queries.push_back({{a, b}, i});
    }
    sort(queries.begin(), queries.end());
    vector<string> res(q);

    

    while (!queries.empty()) {
        pi p;
        int a, b, idx;
        tie(p, idx) = queries.back();
        tie(a, b) = p;
        queries.pop_back();
        
        while (!seg.empty() && seg.back().first >= a) {
            int aa, bb;
            tie(aa, bb) = seg.back();
            seg.pop_back();
            update(1, 0, n-1, aa, bb, bb);
        }

        int mx = query(1, 0, n-1, a, b);

        res[idx] = (mx <= b) ? "YES" : "NO";
    }

    for (const auto& ans : res) {
        cout << ans << '\n';
    }
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 15
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36
• Subtask 6: 0 / 20