Submission #1052283

#	Time	Username	Problem	Language	Result	Execution time	Memory
1052283		VMaksimoski008	Autobahn (COI21_autobahn)	C++17	100 / 100	115 ms	12988 KiB

autobahn

#include <bits/stdc++.h>
//#define int long long

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;

signed main() {
    int n, k, x;
    ll ans = 0;
    cin >> n >> k >> x;

    vector<array<int, 2> > v;
    for(int i=0; i<n; i++) {
        int l, t, r;
        cin >> l >> t >> r;
        v.push_back({ l, 0 });
        v.push_back({ l + t, 1 });
        v.push_back({ r + 1, 2 });
        v.push_back({ l + x, 3 });
        v.push_back({ l + t + x, 4 });
        v.push_back({ r + x + 1, 5 });
    }

    sort(v.begin(), v.end());

    ll prv=-1, st=0, ed=0, curr=0, chargeSt=0, chargeEd=0;
    for(auto &[t, type] : v) {
        ll coef = 0;
        if(st >= k) coef += chargeSt;
        if(ed >= k) coef -= chargeEd;
        curr += coef * (t - prv);

        if(type == 0) st++;
        if(type == 1) chargeSt++;
        if(type == 2) st--, chargeSt--;
        if(type == 3) ed++;
        if(type == 4) chargeEd++;
        if(type == 5) ed--, chargeEd--;

        ans = max(ans, curr);
        prv = t;
    }

    cout << ans << '\n';
    return 0;
}

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