Submission #476921

#	Time	Username	Problem	Language	Result	Execution time	Memory
476921		Drew_	Xylophone (JOI18_xylophone)	C++17	0 / 100	1 ms	256 KiB

xylophone

#include "xylophone.h"
#include <bits/stdc++.h>
using namespace std;

int a[5069];
void solve(int n)
{
	int l = 1, r = n-1;
	while (l < r)
	{	
		int mid = (l + r + 1) >> 1;
		if (query(mid, n) == n-1) l = mid;
		else r = mid - 1;
	}

	a[l] = 1;
	for (int i = l-1, prv = 0; i >= 1; --i)
	{
		int x = query(i, l);
		if (x > prv) a[i] = x+1;
		prv = x;
	}

	for (int i = l-1, prv = l; i >= 1; --i)
	{
		if (a[i]) prv = i;
		else a[i] = a[prv] - query(i, prv);
	}	

	for (int i = l+1, prv = 0; i <= n; ++i)
	{
		int x = query(l, i);
		if (x > prv) a[i] = x+1;
		prv = x;
	}

	for (int i = l+1, prv = l; i <= n; ++i)
	{
		if (a[i]) prv = i;
		else a[i] = a[prv] - query(prv, i);
	}

	// for (int i = 1; i <= n; ++i)
	// 	cerr << a[i] << " \n"[i == n];

	for (int i = 1; i <= n; ++i)
		answer(i, a[i]);
}

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