Submission #151018

#	Time	Username	Problem	Language	Result	Execution time	Memory
151018		bogdan10bos	Organizing the Best Squad (FXCUP4_squad)	C++17	47 / 100	2445 ms	41844 KiB

squad

#include "squad.h"
#include <bits/stdc++.h>
#pragma GCC optimize ("Ofast")

typedef double LD;

using namespace std;

const LD eps = 1e-6;

class LiChao
{
public:
	struct Line
	{
		LD a = 0, b = 0;
		int id = 0;

		Line() { ; }
		Line(LD _a, LD _b, int _id) { a = _a, b = _b, id = _id; }

		LD operator()(LD x)
		{
			return a * x + b;
		}

		const bool operator== (const Line &l) const
		{
			return (id == l.id);
		}
	};

	struct Node
	{
		Line unu, doi;
		Node *l, *r;

		Node(Line a, Line b, Node *_l, Node *_r)
		{
			unu = a, doi = b, l = _l, r = _r;
		}
	};

	Line df;
	Node *root;

	LiChao()
	{
		df = Line(0, 0, -1);
		root = new Node(df, df, 0, 0);
	}

	void insert(Node *&nod, LD st, LD dr, Line l)
	{
		if(l == df)	return;
		if(nod == 0)
		{
			nod = new Node(l, df, 0, 0);
			return;
		}

		LD mij = (st + dr) / 2.0;
		if(nod->unu(mij) < l(mij))
		{
			swap(nod->unu, l);
			swap(nod->doi, l);
		}
		else if(nod->doi(mij) < l(mij))
			swap(nod->doi, l);

		if(l == df)	return;

		if(l(st) > max(nod->unu(st), nod->doi(st)))
			insert(nod->l, st, mij, l);
		if(l(dr) > max(nod->unu(dr), nod->doi(dr)))
			insert(nod->r, mij, dr, l);
	}

	void insert(LD a, LD b, int id)
	{
		insert(root, 0, 1e9, Line(a, b, id));
	}

	pair<Line, Line> query(Node *nod, LD st, LD dr, LD x)
	{
		if(nod == 0)	return {df, df};

		Line unu = nod->unu, doi = nod->doi;
		if(unu(x) < doi(x))	swap(unu, doi);
		pair<Line, Line> nxt = {df, df};

		LD mij = st + (dr - st) / 2;
		if(x < mij)	nxt = query(nod->l, st, mij, x);
		else	nxt = query(nod->r, mij, dr, x);

		if(nxt.first(x) > unu(x))
		{
			swap(doi, nxt.first);
			swap(unu, doi);
		}
		else if(nxt.first(x) > doi(x))
			swap(doi, nxt.first);

		if(nxt.second(x) > unu(x))
		{
			swap(doi, nxt.second);
			swap(unu, doi);
		}
		else if(nxt.second(x) > doi(x))
			swap(doi, nxt.second);

		return {unu, doi};
	}

	pair<Line, Line> query(LD x)
	{
		return query(root, 0, 1e9, x);
	}
};
LiChao att, def;

vector<int> AA, DD, PP;
void Init(vector<int> A, vector<int> D, vector<int> P)
{
	AA = A, DD = D, PP = P;
	int N = A.size();
	for(int i = 0; i < N; i++)
	{
		att.insert(A[i], P[i], i);
		def.insert(D[i], P[i], i);
	}
}

long long calc(int a, int d, int X, int Y)
{
	if(a == d)	return -1;
	long long ans = 1LL * X * (AA[a] + DD[d]) + 1LL * Y * (PP[a] + PP[d]);
	return ans;
}

long long BestSquad(int X, int Y)
{
	LD frac = LD(X) / LD(Y);
	auto at = att.query(frac);
	auto df = def.query(frac);

	vector<int> ids;
	ids.push_back(at.first.id);
	ids.push_back(at.second.id);
	ids.push_back(df.first.id);
	ids.push_back(df.second.id);

	long long ans = -1;
	ans = max(ans, calc(ids[0], ids[2], X, Y));
	ans = max(ans, calc(ids[1], ids[2], X, Y));
	ans = max(ans, calc(ids[0], ids[3], X, Y));
	return ans;
}

• Subtask 1: 19 / 19
• Subtask 2: 28 / 28
• Subtask 3: 0 / 53