Submission #387583

#	Time	Username	Problem	Language	Result	Execution time	Memory
387583		idontreallyknow	Art Exhibition (JOI18_art)	C++17	50 / 100	1038 ms	83516 KiB

art

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
template <class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class A> ostream& operator<<(ostream &cout, vector<A> const &v) {cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";};
template<class A, class B> ostream& operator<<(ostream &cout, const pair<A,B> &x) {return cout << "(" <<x.first << ", " << x.second << ")";};
template <class T> void pv(T a, T b) {cerr << "["; for (T i = a; i != b; ++i) cerr << *i << " "; cerr << "]\n";}
void _print() {cerr << "]\n";}
template <class T, class... V> void _print(T t, V... v) {cerr << t; if (sizeof...(v)) cerr << ", "; _print(v...);}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#define fi first
#define se second
#define SZ(x) (int)((x).size())
#define pii pair<ll,ll>
pii a[500005];
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin >> n;
	map<ll,ll> ma;
	for (int q = 0; q < n; q++) {
		cin >> a[q].fi >> a[q].se;
		ma[a[q].fi] = 0;
	}
	sort(a, a+n);
	int cur = 1;
	auto it = ma.begin();
	vector<ll> rma;
	rma.push_back(0);
	while (it != ma.end()) {
		rma.push_back(it->fi);
		it->se = cur++;
		it++;
	}
	vector<ll> pref(cur+5);
	int ptr = 0;
	int upd = 1;
	while (ptr < n) {
		int pt = ptr;
		ll tot = 0;
		while (pt < n && a[pt].fi == a[ptr].fi) {
			tot += a[pt].se;
			pt++;
		}
		pref[upd] = pref[upd-1]+tot;
		upd++;
		ptr = pt;
	}
	multiset<ll> stuff;
	for (int q = 1; q < cur; q++) {
		stuff.insert(pref[q]-rma[q]);
	}
	ll ans = LLONG_MIN;
	for (int q = 0; q < cur-1; q++) {
		assert(SZ(stuff));
		ans = max(ans, *stuff.rbegin()+rma[q+1]-pref[q]);
		auto it1 = stuff.find(pref[q+1]-rma[q+1]);
		assert(it1 != stuff.end());
		stuff.erase(it1);
	}
	cout << ans << "\n";
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 50