Submission #959839

#	Time	Username	Problem	Language	Result	Execution time	Memory
959839		ono_de206	Autobahn (COI21_autobahn)	C++14	100 / 100	133 ms	17548 KiB

autobahn

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

#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second

#define int long long

typedef long long ll;
typedef vector<int> vi;
typedef set<int> si;
typedef multiset<int> msi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
typedef pair<int, int> P;

template<typename T, typename U>
ostream & operator << (ostream &out, const pair<T, U> &c) {
	out << c.first << ' ' << c.second;
	return out;
}

template<typename T>
ostream & operator << (ostream &out, vector<T> &v) {
	const int sz = v.size();
	for (int i = 0; i < sz; i++) {
		if (i) out << ' ';
		out << v[i];
	}
	return out;
}

template<typename T>
istream & operator >> (istream &in, vector<T> &v) {
	for (T &x : v) in >> x;
	return in;
}

template<typename T, typename U>
	istream & operator >> (istream &in, pair<T, U> &c) {
	in >> c.first;
	in >> c.second;
	return in;
}

template<typename T>
void mxx(T &a, T b){if(b > a) a = b;}
template<typename T>
void mnn(T &a, T b){if(b < a) a = b;}

const int mxn = 5e5 + 10, MXLOG = 22, mod = 1e9 + 7;
const long long inf = 1e18 + 10;

void go() {
	int n, k, x;
	cin >> n >> k >> x;
	vector<pair<int, int>> A, B;
	for(int i = 1; i <= n; i++) {
		int l, t, r;
		cin >> l >> t >> r;
		A.eb(l, r);
		if(l + t <= r) B.eb(l + t, r);
	}
	vector<int> val;
	for(auto it : A) {
		val.pb(it.ff - 1);
		val.pb(it.ss);
	}
	for(auto it : B) {
		val.pb(it.ff - 1);
		val.pb(it.ss);
	}
	sort(all(val));
	val.erase(unique(all(val)), val.end());
	n = val.size();
	vector<int> pre(n), ext(n), sum(n);
	for(auto it : A) {
		it.ff = lower_bound(all(val), it.ff) - val.begin();
		it.ss = lower_bound(all(val), it.ss) - val.begin();
		pre[it.ff]++;
		if(it.ss + 1 < n) pre[it.ss + 1]--;
	}
	for(auto it : B) {
		it.ff = lower_bound(all(val), it.ff) - val.begin();
		it.ss = lower_bound(all(val), it.ss) - val.begin();
		ext[it.ff]++;
		if(it.ss + 1 < n) ext[it.ss + 1]--;
	}
	for(int i = 1; i < n; i++) {
		pre[i] += pre[i - 1];
		ext[i] += ext[i - 1];
		if(pre[i] >= k) sum[i] = ext[i];
	}
	int l = 0, now = 0, ans = 0;
	for(int i = 1; i < n; i++) {
		now += sum[i] * (val[i] - val[i - 1]);
		while(val[i] - val[l] > x) {
			l++;
			now -= sum[l] * (val[l] - val[l - 1]);
		}
		int need = x - (val[i] - val[l]);
		mxx(ans, now + need * sum[l]);
	}
	l = n - 1, now = 0;
	for(int i = n - 1; i > 0; i--) {
		now += sum[i] * (val[i] - val[i - 1]);
		while(val[l] - val[i - 1] > x) {
			now -= sum[l] * (val[l] - val[l - 1]);
			l--;
		}
		int need = x - (val[l] - val[i - 1]);
		mxx(ans, now);
		if(l + 1 < n) mxx(ans, now + need * sum[l + 1]);
	}
	cout << ans << endl;
}

signed main() {
	fast;
	int t = 1;
	// cin >> t;
	while(t--) {
		go();
	}
	return 0;
}

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