Submission #1003576

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003576		ThegeekKnight16	Autobahn (COI21_autobahn)	C++17	100 / 100	721 ms	94668 KiB

autobahn

#include <bits/stdc++.h>
using namespace std;
#define int long long

int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int N, K, X;
    cin >> N >> K >> X;
    vector<tuple<int, int, int>> sweep;
    set<int> vals;
    for (int i = 0; i < N; i++)
    {
        int L, T, R;
        cin >> L >> T >> R;
        T = min(L+T-1, R);
        sweep.emplace_back(L, 0, -1); vals.insert(L);
        sweep.emplace_back(T+1, 1, -1); vals.insert(T+1);
        sweep.emplace_back(R+1, 2, -1); vals.insert(R+1);
        sweep.emplace_back(T, 4, 3*i); sweep.emplace_back(T+X, 5, 3*i); vals.insert(T); vals.insert(T+X);
        sweep.emplace_back(R-X, 4, 3*i + 1); sweep.emplace_back(R, 5, 3*i + 1); vals.insert(R-X); vals.insert(R);
        sweep.emplace_back(L-1, 4, 3*i + 2); sweep.emplace_back(L+X-1, 5, 3*i + 2); vals.insert(L-1); vals.insert(L+X-1);
    }
    for (auto x : vals) sweep.emplace_back(x, 3, -1);
    vector<int> possResp(3*N);
    sort(sweep.begin(), sweep.end());
    int totPeople = 0, totPaying = 0, totPay = 0, lastX = 0, resp = 0;
    for (auto [x, type, id] : sweep)
    {
        // cerr << "x: " << x << ", totPeople: " << totPeople << ", totPaying: " << totPaying << ", totPay: " << totPay << '\n';
        if (type == 0) totPeople++;
        else if (type == 1) totPaying++;
        else if (type == 2) totPeople--, totPaying--;
        else if (type == 3)
        {
            totPay += (int)(totPeople >= K) * totPaying * (x - lastX);
            lastX = x;
        }
        else if (type == 4) possResp[id] = totPay;
        else resp = max(resp, totPay - possResp[id]);
    }
    cout << resp << '\n';
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50