Submission #881903

#	Time	Username	Problem	Language	Result	Execution time	Memory
881903		elisaipate	Xylophone (JOI18_xylophone)	C++14	100 / 100	60 ms	1548 KiB

xylophone

#include <iostream>
#include "xylophone.h"


using namespace std;

#define nmax 5000

int v2[nmax], v3[nmax], semn[nmax], nr[nmax];
void solve( int n ) {
    int i, x = 0, minn = 0, pozmin = 1, maxx = 0, pozmax = 1, t, aux;
    for( i = 1; i < n; i++ )
        v2[i] = query( i, i + 1 );

    for( i = 1; i < n - 1; i++ )
        v3[i] = query( i, i + 2 );

    semn[1] = 1;
    for( i = 1; i < n - 1; i++ ) {
        if( v3[i] == v2[i] + v2[i + 1] )
            semn[i+1] = semn[i];
        else
            semn[i+1] = - semn[i];
    }

    for( i = 2; i <= n; i++ ) {
        x = x + v2[i-1] * semn[i-1];
        //cout << x << " ";
        if( x < minn ) {
            minn = x;
            pozmin = i;
        } else if( x > maxx ) {
            maxx = x;
            pozmax = i;
        }
    }
    //cout << "\n";
    t = 1;
    if( pozmin > pozmax ) {
        t = -1;
        aux = pozmin;
        pozmin = pozmax;
        pozmax = aux;
    }
    nr[pozmin] = 1;
    for( i = pozmin + 1; i <= n; i++ )
        nr[i] = nr[i-1] + v2[i-1] * t * semn[i-1];

    for( i = pozmin - 1; i >= 1; i-- )
        nr[i] = nr[i+1] - v2[i] * t * semn[i];
    /*for( i = 1; i <= n; i++ )
        cout << semn[i] << " ";

    cout << "\n";
    cout << pozmin << " " << pozmax;

    cout << "\n";*/
    for( i = 1; i <= n; i++ )
        answer( i, nr[i] );
}

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