Submission #1159904

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159904		Der_Vlapos	Xylophone (JOI18_xylophone)	C++20	100 / 100	28 ms	1036 KiB

xylophone

#include "xylophone.h"
#include <bits/stdc++.h>

using namespace std;

#define pii pair<int, int>
#define f first
#define s second
#define ll long long
#define pb push_back
#define all(v) v.begin(), v.end()

map<pii, int> rem;

int req(int l, int r)
{
	if (rem[{l, r}])
		return rem[{l, r}];
	return rem[{l, r}] = query(l + 1, r + 1);
}

void solve(int n)
{
	{
		vector<int> a(n);
		a[0] = 0;
		a[1] = req(0, 1);
		int p = 0;

		for (int i = p + 2; i < n; ++i)
		{
			int v1 = req(i - 2, i);
			int v2 = req(i - 1, i);
			int mx = max(a[i - 2], a[i - 1]);
			int mn = min(a[i - 2], a[i - 1]);
			int d = mx - mn;
			if (d == v1)
			{
				if (a[i - 1] == mn)
					a[i] = a[i - 1] + v2;
				else
					a[i] = a[i - 1] - v2;
			}
			else
			{
				if (v1 == v2)
				{
					if (a[i - 1] == mn)
						a[i] = a[i - 1] + v2;
					else
						a[i] = a[i - 1] - v2;
				}
				else
				{
					if (a[i - 1] == mn)
						a[i] = a[i - 1] - v2;
					else
						a[i] = a[i - 1] + v2;
				}
			}
		}

		int mn = 0;
		for (int i = 0; i < n; ++i)
			mn = min(mn, a[i]);
		for (int i = 0; i < n; ++i)
		{
			a[i] -= mn;
		}
		bool good = true;
		vector<int> pos(n);
		for (int i = 0; i < n; ++i)
		{
			if (0 <= a[i] and a[i] < n)
			{
			}
			else
			{
				good = false;
				break;
			}
			pos[a[i]] = i;
		}

		if (good and pos[0] < pos[n - 1])
			for (int i = 1; i <= n; i++)
				answer(i, a[i - 1] + 1);
	}
	{
		vector<int> a(n);
		a[0] = 0;
		a[1] = -req(0, 1);
		int p = 0;

		for (int i = p + 2; i < n; ++i)
		{
			int v1 = req(i - 2, i);
			int v2 = req(i - 1, i);
			int mx = max(a[i - 2], a[i - 1]);
			int mn = min(a[i - 2], a[i - 1]);
			int d = mx - mn;
			if (d == v1)
			{
				if (a[i - 1] == mn)
					a[i] = a[i - 1] + v2;
				else
					a[i] = a[i - 1] - v2;
			}
			else
			{
				if (v1 == v2)
				{
					if (a[i - 1] == mn)
						a[i] = a[i - 1] + v2;
					else
						a[i] = a[i - 1] - v2;
				}
				else
				{
					if (a[i - 1] == mn)
						a[i] = a[i - 1] - v2;
					else
						a[i] = a[i - 1] + v2;
				}
			}
		}

		int mn = 0;
		for (int i = 0; i < n; ++i)
			mn = min(mn, a[i]);
		for (int i = 0; i < n; ++i)
			a[i] -= mn;

		bool good = true;
		vector<int> pos(n);
		for (int i = 0; i < n; ++i)
		{
			if (0 <= a[i] and a[i] < n)
			{
			}
			else
			{
				good = false;
				break;
			}
			pos[a[i]] = i;
		}

		if (good and pos[0] < pos[n - 1])
			for (int i = 1; i <= n; i++)
				answer(i, a[i - 1] + 1);
	}
}

• Subtask 1: 11 / 11
• Subtask 2: 36 / 36
• Subtask 3: 53 / 53