Submission #227445

#	Time	Username	Problem	Language	Result	Execution time	Memory
227445		muhammad_hokimiyon	Xylophone (JOI18_xylophone)	C++14	47 / 100	103 ms	512 KiB

xylophone

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

const int NN = 5e3 + 7;

int b[NN];

int get( int x , int y , int x1 , int y1 )
{
    if( x1 > y1 ){
        if( y == x1 - y1 )return x1 - x;
        if( x == y )return x1 - x;
        return x1 + x;
    }else{
        if( y == x + y1 - x1 )return x1 - x;
        if( y == y1 - x1 )return x1 + x;
        return x1 + x;
    }
}

void solve(int n)
{
    int i = 1 , j = n;
    int l = i , r = n;
    while( l < r ){
        int m = (l + r) / 2;
        if( query( m + 1 , n ) != n - 1 )r = m;
        else l = m + 1;
    }
    i = l;
    b[i] = 1;
    if( i != 1 )b[i - 1] = query( i - 1 , i ) + 1;
    b[i + 1] = query( i , i + 1 ) + 1;
    for( int h = i - 2; h >= 1; h-- ){
        int x = query( h , h + 1 );
        int y = query( h , h + 2 );
        b[h] = get( x , y , b[h + 1] , b[h + 2] );
    }
    for( int h = i + 2; h <= n; h++ ){
        int x = query( h - 1 , h );
        int y = query( h - 2 , h );
        b[h] = get( x , y , b[h - 1] , b[h - 2] );
    }
    for( int h = 1; h <= n; h++ ){
        answer( h , b[h] );
    }
}

Compilation message (stderr)

xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:23:17: warning: unused variable 'j' [-Wunused-variable]
     int i = 1 , j = n;
                 ^

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