Submission #520503

#	Time	Username	Problem	Language	Result	Execution time	Memory
520503		kartel	Autobahn (COI21_autobahn)	C++14	0 / 100	1 ms	332 KiB

autobahn

#include <bits/stdc++.h>
//#include<ext/rope>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("-O3")
//#pragma GCC target("avx2")


#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#define F first
#define S second
#define pb push_back
#define sz(x) int(x.size())
#define el '\n'
#define all(x) x.begin(), x.end()

using namespace std;
//using namespace __gnu_pbds;
//using  namespace __gnu_cxx;

typedef long long ll;
typedef long double ld;
typedef short int si;
typedef unsigned long long ull;
//typedef tree <ll, null_type, less <ll> , rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const int N = 5e5 + 500;

int pf[N];
ll cnt[N];
int pf1[N];
int l, r, t, n, k, x;
vector <int> v;
vector <pair <int, int> > seg, ex;

int main()
{
//    cerr.precision(7);
//    cerr << fixed;
    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//    in("23.in");
//    in("input.txt");
//    out("output.txt");
//    clock_t start = clock();

    cin >> n >> k >> x;
    for (int i = 1; i <= n; i++) {
        cin >> l >> t >> r;
        v.pb(l); v.pb(r); v.pb(r + 1);
        seg.pb({l, r});
        if (l + t <= r) {
            v.pb(l + t);
            ex.pb({l + t, r});
        }
    }

    map <int, int> mp;
    v.pb(2e9);
    sort(all(v));
    v.resize(unique(all(v)) - v.begin());
    for (int i = 0; i < sz(v); i++) {
        mp[v[i]] = i + 1;
    }
    for (int i = 0; i < sz(seg); i++) {
        pf[mp[seg[i].F]]++;
        pf[mp[seg[i].S + 1]]--;
    }
    for (int i = 1; i <= sz(v); i++) {
        pf[i] += pf[i - 1];
        if (i != sz(v)) {
//            cout << "[" << v[i - 1] << ", " << v[i] << ")" << " = " << pf[i] << el;
        }
    }
    for (int i = 0; i < sz(ex); i++) {
        pf1[mp[ex[i].F]]++;
        pf1[mp[ex[i].S + 1]]--;
    }
    for (int i = 1; i <= sz(v); i++) {
        pf1[i] += pf1[i - 1];
        if (i != sz(v)) {
//            cout << "[" << v[i - 1] << ", " << v[i] << ")" << " = " << pf1[i] << el;
        }
    }
    for (int i = 1; i <= sz(v); i++) {
        cnt[i] += cnt[i - 1];
        if (i < sz(v) && pf[i] >= k) {
            cnt[i] += pf1[i] * (v[i] - v[i - 1]);
        }
    }

    ll ans = 0;
    for (int i = 1, j = 1; i < sz(v); i++) {
        while (j <= sz(v) && v[j - 1] - v[i - 1] < x) {
            j++;
        }
        ll cur = cnt[j] - cnt[i - 1];
        if (pf[j] >= k) {
            cur -= pf1[j] * (v[j - 1] - (v[i - 1] + x - 1));
        }
//        cerr << v[i - 1] << " " << v[j - 1] << " " << cur << el;
        ans = max(ans, cur);
    }
    cout << ans;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 50