Submission #503227

#	Time	Username	Problem	Language	Result	Execution time	Memory
503227		MasterTaster	Xylophone (JOI18_xylophone)	C++14	100 / 100	97 ms	544 KiB

xylophone

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

#define pb push_back
#define ll long long
#define pii pair<int, int>
#define xx first
#define yy second
#define MAXN 5010

using namespace std;

static int A[5000];

bool bio[MAXN];
int ress[MAXN], diff[MAXN];

void solve(int n) {

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

    int l=1, r=n;
    int kec=-1;
    while (l<=r)
    {
        int mid=l+(r-l)/2;
        if (query(mid, n)==n-1)
        {
            kec=mid;
            l=mid+1;
        }
        else
            r=mid-1;
    }
    ress[kec]=1; bio[1]=true;

    if (kec!=1) ress[kec-1]=1+diff[kec];
    ress[kec+1]=1+diff[kec+1];

    bio[ress[kec-1]]=true; bio[ress[kec+1]]=true;

    for (int i=kec-1; i>1; i--)
    {
        if (bio[ress[i]+diff[i]]) ress[i-1]=ress[i]-diff[i];
        else if (bio[ress[i]-diff[i]]) ress[i-1]=ress[i]+diff[i];

        else if (ress[i]>ress[i+1])
        {
            int sta=query(i-1, i+1);
            if (sta==(ress[i]-ress[i+1])) { ress[i-1]=ress[i]-diff[i]; }
            else if (sta==(diff[i]+ress[i]-ress[i+1])) { ress[i-1]=ress[i]+diff[i]; }
            else { ress[i-1]=ress[i]-diff[i]; }
        }
        else
        {
            int sta=query(i-1, i+1);
            if (sta==(ress[i+1]-ress[i])) { ress[i-1]=ress[i]+diff[i]; }
            else if (sta==(diff[i]+ress[i+1]-ress[i])) { ress[i-1]=ress[i]-diff[i]; }
            else { ress[i-1]=ress[i]+diff[i]; }
        }
        bio[ress[i-1]]=true;
    }

    for (int i=kec+1; i<n; i++)
    {
        if (bio[ress[i]+diff[i+1]]) ress[i+1]=ress[i]-diff[i+1];
        else if (bio[ress[i]-diff[i+1]]) ress[i+1]=ress[i]+diff[i+1];

        else if (ress[i]>ress[i-1])
        {
            int sta=query(i-1, i+1);
            if (sta==(ress[i]-ress[i-1])) { ress[i+1]=ress[i]-diff[i+1]; }
            else if (sta==(diff[i+1]+ress[i]-ress[i-1])) { ress[i+1]=ress[i]+diff[i+1]; }
            else { ress[i+1]=ress[i]-diff[i+1]; }
        }
        else
        {
            int sta=query(i-1, i+1);
            if (sta==(ress[i-1]-ress[i])) { ress[i+1]=ress[i]+diff[i+1]; }
            else if (sta==(diff[i+1]+ress[i-1]-ress[i])) { ress[i+1]=ress[i]-diff[i+1]; }
            else { ress[i+1]=ress[i]+diff[i+1]; }
        }

        bio[ress[i+1]]=true;
    }

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

Compilation message (stderr)

xylophone.cpp:13:12: warning: 'A' defined but not used [-Wunused-variable]
   13 | static int A[5000];
      |            ^

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