제출 #43093

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
43093		RayaBurong25_1	커다란 상품 (IOI17_prize)	C++14	0 / 100	1000 ms	3584 KiB

prize

#include "prize.h"
#include <stdio.h>
#include <vector>
#include <algorithm>
int L[200005], R[200005];
std::vector<int> V;
std::vector<int> W;
int min(int a, int b)
{
	return (a < b)?a:b;
}
int max(int a, int b)
{
	return (a > b)?a:b;
}
int find_best(int n) {
	int i;
	for (i = 0; i < n; i++)
		L[i] = -1;
	int sqrtn;
	for (sqrtn = 1; sqrtn*sqrtn < n; sqrtn++);
	// printf("sqrtn %d\n", sqrtn);
	std::vector<int> r;
	for (i = 0; i*sqrtn < n; i++)
	{
		r = ask(i*sqrtn);
		L[i*sqrtn] = r[0];
		R[i*sqrtn] = r[1];
		V.push_back(-r[1]);
		W.insert(W.begin(), -r[0]);
	}
	int sig = 0;
	int mn, md, mx;
	//find first sig
	mn = 0;
	mx = n - 1;
	while (mn != mx)
	{
		if (mx - mn == 1)
		{
			sig = mx;
			break;
		}
		md = (mn + mx)/2;
		if (L[md] == -1)
		{
			r = ask(md);
			L[md] = r[0];
			R[md] = r[1];
		}
		if (R[md] >= R[sig])
			mn = md;
		else
			mx = md;
	}
	if (mn == mx)
		sig = mn;
	if (L[sig] == -1)
	{
		r = ask(sig);
		L[sig] = r[0];
		R[sig] = r[1];
	}
	int ssig = sig;
	//go right
	while (L[sig] != 0 || R[sig] != 0)
	{
		// printf("sig %d\n", sig);
		mx = std::lower_bound(V.begin() + sig/sqrtn + 1, V.end(), -R[sig]) - V.begin();
		mx *= sqrtn;
		mx = min(mx, n - 1);
		mn = mx - sqrtn;
		mn = max(mn, sig);
		// printf("sig %d mn %d mx %d\n", sig, mn, mx);
		while (mn != mx)
		{
			if (mx - mn == 1)
			{
				sig = mx;
				break;
			}
			md = (mn + mx)/2;
			if (L[md] == -1)
			{
				r = ask(md);
				L[md] = r[0];
				R[md] = r[1];
			}
			if (R[md] > R[sig])
				mn = md;
			else
				mx = md;
		}
		if (mn == mx)
			sig = mn;
		if (L[sig] == -1)
		{
			r = ask(sig);
			L[sig] = r[0];
			R[sig] = r[1];
		}
		if (sig == n - 1 && (L[sig] != 0 || R[sig] != 0))
			break;
	}
	if (sig == n - 1 && (L[sig] != 0 || R[sig] != 0))
	{
		sig = ssig;
		while (L[sig] != 0 || R[sig] != 0)
		{
			// printf("sig %d\n", sig);
			mn = W.end() - 1 - std::lower_bound(W.end() - 1 - sig/sqrtn, W.end(), -L[sig]);
			mn *= sqrtn;
			mn = max(mx, 0);
			mx = mn + sqrtn;
			mx = min(mx, sig);
			// printf("sig %d mn %d mx %d\n", sig, mn, mx);
			while (mn != mx)
			{
				if (mx - mn == 1)
				{
					sig = mn;
					break;
				}
				md = (mn + mx)/2;
				if (L[md] == -1)
				{
					r = ask(md);
					L[md] = r[0];
					R[md] = r[1];
				}
				if (L[md] > L[sig])
					mx = md;
				else
					mn = md;
			}
			if (mn == mx)
				sig = mn;
			if (L[sig] == -1)
			{
				r = ask(sig);
				L[sig] = r[0];
				R[sig] = r[1];
			}
		}
		return sig;
	}
	else
		return sig;
}

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