Submission #1296734

#	Time	Username	Problem	Language	Result	Execution time	Memory
1296734		florescent	Exhibition (JOI19_ho_t2)	C++20	100 / 100	377 ms	7480 KiB

joi2019_ho_t2

//STRIKER!
#include <iostream> 
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <set>
#include <unordered_map>
#include <cmath>
#include <queue>
#include <iomanip>

using namespace std;
#define int int64_t
#define pb push_back
#define speed cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(false);
#define all(a) a.begin(), a.end()
#define sz(a) ((int)a.size())

int n, m;
vector<pair<int, int>> a;
vector<int> sizm;

bool check(int mid) {
    multiset<int> st;
    int j = 0;
    int lst = -1;
    for (int i = m - mid; i < m; i++) {
        while (j < n and a[j].first <= sizm[i]) {
            st.insert(a[j].second);
            j++;
        }

        auto it = st.lower_bound(lst);
        if (it == st.end()) {
            return 0;
        }
        lst = *it;
        st.erase(it);
    }
    return 1;
}

void sol() {
    cin >> n >> m;
    a.resize(n);
    sizm.resize(m);
    for (int i = 0; i < n; i++) {
        cin >> a[i].first >> a[i].second;
    }
    sort(all(a));
    for (int i = 0; i < m; i++) {
        cin >> sizm[i];
    }
    sort(all(sizm));

    int l = 0, r = min(m, n), ans = 0;
    while (l <= r) {
        int mid = (l + r) / 2;
        if (check(mid)) {
            ans = mid;
            l = mid + 1;
        }
        else {
            r = mid - 1;
        }
    }

    cout << ans;
}

int32_t main() {
    speed;
    int t = 1;
    //cin >> t;

    while (t--) {
        sol();
    }

    return 0;
}

//freopen("name", "r", stdin);
//freopen("name", "w", stdout);

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50