Submission #321613

#	Time	Username	Problem	Language	Result	Execution time	Memory
321613		Lawliet	Xylophone (JOI18_xylophone)	C++17	0 / 100	3 ms	492 KiB

xylophone

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

using namespace std;

const int MAXN = 5010;

int n;

int v[MAXN];
int ans[MAXN];
int diff[MAXN][2], t[MAXN];

int signal(int s)
{
	if( s > 0 ) return 1;
	return -1;
}

bool test()
{
	for(int i = 1 ; i <= n ; i++)
		t[i] = diff[i][0];

	for(int i = 2 ; i < n ; i++)
	{
		t[i] = abs( t[i] );

		if( diff[i - 1][0] + diff[i][0] == diff[i - 1][1] ) t[i] *= signal( t[i - 1] );
		else t[i] *= signal( -t[i - 1] );
	}

	for(int i = 2 ; i <= n ; i++)
		ans[i] = ans[i - 1] + t[i - 1];

	int mn = ans[1];

	for(int i = 1 ; i <= n ; i++)
		mn = min( mn , ans[i] );

	for(int i = 1 ; i <= n ; i++)
		ans[i] += -mn + 1;

	int prefixMn = n + 1;

	for(int i = 1 ; i <= n ; i++)
	{
		if( ans[i] == n && prefixMn != 1 ) return false;
		prefixMn = min( prefixMn , ans[i] );
	}

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

	return true;
}

void solve(int N) 
{
	n = N;

	for(int i = 1 ; i + 1 <= N ; i++)
		diff[i][0] = query( i , i + 1 );

	for(int i = 1 ; i + 2 <= N ; i++)
		diff[i][1] = query( i , i + 2 );

	if( !test() )
	{
		diff[1][0] = -diff[1][0];
		test();
	}
}

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