Submission #387593

#	Time	Username	Problem	Language	Result	Execution time	Memory
387593		idontreallyknow	Art Exhibition (JOI18_art)	C++17	0 / 100	0 ms	332 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>
#define SIZE (1<<21)
#define Getchar() (pr1 == pr2 && (pr2 = (pr1 = fr) + fread(fr, 1, SIZE, stdin), pr1 == pr2) ? EOF : *pr1++)
#define Putchar(ch) (pw < SIZE ? fw[pw++] = (ch) : (fwrite(fw, 1, SIZE, stdout), fw[(pw = 0)++] = (ch)))
char fr[SIZE], *pr1 = fr, *pr2 = fr;
template<class T> inline void read(T& f) {
	f = 0; T sgn = 1; char c = Getchar();
	while (!isdigit(c)) {if (c == '-') sgn = -1; c = Getchar();}
	while (isdigit(c)) {f = f*10+(c&15); c = Getchar();}
	f *= sgn;
}
template<class T, class... V> inline void read(T& t, V&... v) {read(t); read(v...);}
const int mx = 500005;
pii a[mx];
int nxt[mx], prv[mx], las;
void unlink(int x) {
	int y = nxt[x], z = prv[x];
	if (y != 0) {
		if (z != 0) {
			prv[y] = z;
			prv[z] = y;
		} else {
			nxt[y] = 0;
		}
	} else {
		if (z != 0) {
			las = z;
			prv[z] = 0;
		}
	}
}
int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n;
	read(n);
	map<ll,ll> ma;
	for (int q = 0; q < n; q++) {
		read(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;
	}
	vector<pii> f(cur);
	for (int q = 1; q < cur; q++) {
		f[q] = {pref[q]-rma[q],q};
	}
	sort(f.begin()+1, f.end());
	for (int q = 1; q < cur; q++) {
		if (q > 1) prv[f[q].se] = f[q-1].se;
		if (q < cur-1) nxt[f[q].se] = f[q+1].se;
	}
	las = f[cur-1].se;
	ll ans = LLONG_MIN;
	for (int q = 0; q < cur-1; q++) {
		ans = max(ans, pref[las]-rma[las]+rma[q+1]-pref[q]);
		unlink(q+1);
	}
	cout << ans << "\n";
	return 0;
}

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