Submission #1238728

#	Time	Username	Problem	Language	Result	Execution time	Memory
1238728		CyberCow	Longest Trip (IOI23_longesttrip)	C++20	5 / 100	5 ms	404 KiB

longesttrip

#include "longesttrip.h"
#include <vector>
#include <deque>
#include <algorithm>
using namespace std;


vector<int> longest_trip(int N, int D)
{
	vector<int> ans;
	vector<int> a = { 0 }, b = { 1 };
	for (int i = 2; i < N; i++)
	{
		if (are_connected({ a.back() }, { i }))
		{
			a.push_back(i);
		}
		else if (are_connected({ b.back() }, { i }))
		{
			b.push_back(i);
		}
		else
		{
			for (int j = b.size() - 1; j >= 0; j--)
			{
				a.push_back(b[j]);
			}
			b.clear();
			b.push_back(i);
		}
	}
	if (a.size() < b.size())swap(a, b);
	if (are_connected(a, b))
	{
		if (are_connected({ a[0] }, { a.back() }))
		{
			if (b.size() != 1)
			{
				//
				if (!are_connected({ b[0] }, { b.back() }))
				{
					if (are_connected({ a.back() }, { b[0] }))
					{
						reverse(b.begin(), b.end());
						while (!b.empty())
						{
							a.push_back(b.back());
							b.pop_back();
						}
					}
					else
					{
						while (!b.empty())
						{
							a.push_back(b.back());
							b.pop_back();
						}
					}
					return a;
				}
			}
			int aket = 0;
			int l = 0, r = a.size() - 1;
			while (l <= r)
			{
				vector<int> harc;
				int m = (l + r) / 2;
				for (int bl = l; bl <= m; bl++)
				{
					harc.push_back(a[bl]);
				}
				if (are_connected(harc, b))
				{
					aket = m;
					r = m - 1;
				}
				else
				{
					l = m + 1;
				}
			}
			if (b.size() == 1)
			{
				//?
				vector<int> tazaans = {b[0]};
				for (int i = aket; i < a.size(); i++)
				{
					tazaans.push_back(a[i]);
				}
				for (int i = 0; i < aket; i++)
				{
					tazaans.push_back(a[i]);
				}
				return tazaans;
			}
			int bket = 0;
			l = 0, r = b.size() - 1;
			while (l <= r)
			{
				vector<int> harc;
				int m = (l + r) / 2;
				for (int bl = l; bl <= m; bl++)
				{
					harc.push_back(b[bl]);
				}
				if (are_connected(harc, a))
				{
					bket = m;
					r = m - 1;
				}
				else
				{
					l = m + 1;
				}
			}
			vector<int> tazaans;
			for (int i = aket + 1; i < a.size(); i++)
			{
				tazaans.push_back(a[i]);
			}
			for (int i = 0; i <= aket; i++)
			{
				tazaans.push_back(a[i]);
			}
			for (int i = bket; i < b.size(); i++)
			{
				tazaans.push_back(b[i]);
			}
			for (int i = 0; i < bket; i++)
			{
				tazaans.push_back(b[i]);
			}
			//throw;
			return tazaans;
		}
		else
		{
			//
			if (are_connected({ a.back()},{ b[0] }))
			{
				reverse(b.begin(), b.end());
				while (!b.empty())
				{
					a.push_back(b.back());
					b.pop_back();
				}
			}
			else
			{
				reverse(b.begin(), b.end());
				reverse(a.begin(), a.end());
				while (!b.empty())
				{
					a.push_back(b.back());
					b.pop_back();
				}
			}
			return a;
		}
	}
	else
	{
		//
		return a;
	}
}

• Subtask 0: 0 / 0
• Subtask 1: 5 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 25
• Subtask 4: 0 / 60