Submission #1221609

#	Time	Username	Problem	Language	Result	Execution time	Memory
1221609		duckindog	Worst Reporter 2 (JOI16_worst_reporter2)	C++20	100 / 100	226 ms	22020 KiB

worst_reporter2

#include <bits/stdc++.h>

using namespace std;

const int N = 200'000 + 10;
int n;
pair<int, int> h1[N], h2[N];

const int MAX = 1'000'000'000;
namespace IT { 
    int f[N << 3], lazy[N << 3];

    void apply(int s, int l, int r) { 
        if (!lazy[s]) return;
        f[s] += lazy[s];
        if (l != r) { 
            lazy[s << 1] += lazy[s];
            lazy[s << 1 | 1] += lazy[s];
        }
        lazy[s] = 0;
    }
    void update(int s, int l, int r, int u, int v, int x) { 
        apply(s, l, r);
        if (v < l || u > r) return;
        if (u <= l && r <= v) { 
            lazy[s] += x;
            apply(s, l, r);
            return;
        }
        int mid = (l + r) >> 1;
        update(s << 1, l, mid, u, v, x);
        update(s << 1 | 1, mid + 1, r, u, v, x);
        f[s] = min(f[s << 1], f[s << 1 | 1]);
    }
    int query(int s, int l, int r, int u, int v) { 
        apply(s, l, r);
        if (v < l || u > r) return MAX;
        if (u <= l && r <= v) return f[s];
        int mid = (l + r) >> 1;
        return min(query(s << 1, l, mid, u, v), query(s << 1 | 1, mid + 1, r, u, v));
    }
}

vector<int> save[N];

int32_t main() { 
    cin.tie(0)->sync_with_stdio(0);

    cin >> n;
    for (int i = 1; i <= n; ++i) cin >> h1[i].first >> h1[i].second;
    for (int i = 1; i <= n; ++i) cin >> h2[i].first >> h2[i].second;

    reverse(h1 + 1, h1 + n + 1);
    reverse(h2 + 1, h2 + n + 1);

    vector<int> allValue;
    { // discrete
        for (int i = 1; i <= n; ++i) { 
            allValue.push_back(h1[i].second);
            allValue.push_back(h2[i].second);
        }
        sort(allValue.begin(), allValue.end());
        allValue.erase(unique(allValue.begin(), allValue.end()), allValue.end());

        for (int i = 1; i <= n; ++i) { 
            h1[i].second = upper_bound(allValue.begin(), allValue.end(), h1[i].second) - allValue.begin();
            h2[i].second = upper_bound(allValue.begin(), allValue.end(), h2[i].second) - allValue.begin();
        }
    }
    const int m = allValue.size();

    int answer = 0;
    for (int i = 1, it = 1; i <= n; ++i) { 
        const auto& [color, point] = h2[i];
        while (it <= n && h1[it].second <= point) { 
            save[h1[it].first].push_back(h1[it].second);
            IT::update(1, 1, m, h1[it].second, m, 1);
            it += 1;
        }
        
        if (save[color].size() && IT::query(1, 1, m, save[color].back(), m) > 0) { 
            IT::update(1, 1, m, save[color].back(), m, -1);
            save[color].pop_back();
        } else { 
            IT::update(1, 1, m, point, m, -1);
            answer += 1;
        }
    }

    cout << answer << "\n";
}

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40