Submission #960649

#	Time	Username	Problem	Language	Result	Execution time	Memory
960649		Nelt	Xylophone (JOI18_xylophone)	C++17	0 / 100	1 ms	428 KiB

xylophone

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

#define ll long long
#define endl "\n"

using namespace std;
map<pair<ll, ll>, ll> mp;
ll ask(ll i, ll j)
{
	return mp.count({i, j}) ? mp[{i, j}] : mp[{i, j}] = query(i, j);
}
void solve(int n) {
	ll a[n + 1];
	ll l = 1, r = n;
	while (l <= r)
	{
		ll mid = (l + r) >> 1;
		if (ask(mid, n) == n - 1)
			l = mid + 1;
		else
			r = mid - 1;
	}
	l--;
	a[l] = 1;
	if (l + 1 <= n)
		a[l + 1] = ask(l, l + 1) + 1;
	for (ll i = l + 2; i <= n; i++)
		if (a[i - 2] < a[i - 1])
		{
			if (ask(i - 2, i) > ask(i - 2, i - 1))
				a[i] = ask(i - 2, i) + a[i - 2];
			else
				a[i] = a[i - 1] - ask(i - 1, i);
		}
		else
		{
			if (ask(i - 2, i) > ask(i - 2, i - 1))
				a[i] = a[i - 2] - ask(i - 2, i);
			else
				a[i] = ask(i - 1, i) + a[i - 1];
		}
	if (l - 1 > 0)
		a[l - 1] = ask(l - 1, l) + 1;
	for (ll i = l - 2; i >= 1; i--)
		if (a[i + 2] < a[i + 1])
		{
			if (ask(i, i + 2) > ask(i + 1, i + 2))
				a[i] = ask(i, i + 2) + a[i + 2];
			else
				a[i] = a[i + 1] - ask(i, i + 1);
		}
		else
		{
			if (ask(i, i + 2) > ask(i + 1, i + 2))
				a[i] = a[i + 2] - ask(i, i + 2);
			else
				a[i] = ask(i, i + 1) + a[i + 1];
		}
	for (ll i = 1; i <= n; i++)
		answer(i, a[i]);
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 36
• Subtask 3: 0 / 53