Submission #1116510

#	Time	Username	Problem	Language	Result	Execution time	Memory
1116510		hyakup	Xylophone (JOI18_xylophone)	C++17	100 / 100	196 ms	584 KiB

xylophone

#include "xylophone.h"
#include <bits/stdc++.h>
using namespace std;
#define bug(x) cerr << #x << " " << x << endl;

void solve(int N) {
	int n = N;
	vector<int> dif( n + 1 ), x( n + 1, 1 );
	for( int i = 2; i <= n; i++ ){
		dif[i] = query( i - 1, i );
		if( i > 2 ){
			int aux = query( i - 2, i );
			if( aux == dif[i - 1] || aux == dif[i] ) x[i] = -x[i - 1];
			else x[i] = x[i - 1];
		}
	}

	pair<int, int> maxi( 0, 1 ), mini( 0, 1 );
	for( int i = 2, sum = 0; i <= n; i++ ){
		sum += dif[i]*x[i];
		maxi = max( maxi, make_pair( sum, i ) );
		mini = min( mini, make_pair( sum, i ) );
	}

	int val;
	if( maxi.second < mini.second ){
		val = 1 + abs(maxi.first);
		for( int i = 2; i <= n; i++ ) x[i] = -x[i];
	}
	else val = 1 + abs(mini.first);
	answer( 1, val );
	for( int i = 2; i <= n; i++ ){
		val += dif[i]*x[i];
		answer( i, val );
	}

}

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