Submission #996218

#	Time	Username	Problem	Language	Result	Execution time	Memory
996218		reginox	Xylophone (JOI18_xylophone)	C++17	Compilation error	0 ms	0 KiB

xylophone

#include<bits/stdc++.h>
#include "xylophone.h"
#define ll long long
#define all(v) begin(v), end(v)
#define pi pair<int, int>
#define vi vector<int>
using namespace std;
int a[5005], n;
int p1[5005], p2[5005];
 
bool thu(int z){
    if(v < 1 || v > n) return false;
    a[1] = 1e4, a[2] = a[1] + z;
    int mi = min(a[1], a[2]);
    for(int i = 3; i <= n; i++){
        if(p2[i]==p1[i]+abs(a[i-2]-a[i-1])){
            if(a[i-2]>a[i-1]){
                a[i]=a[i-1]-p1[i];
            }
            else{
                a[i]=a[i-1]+p1[i];
            }
        }
        else if(p2[i]==max(p1[i],abs(a[i-2]-a[i-1]))){
            if(a[i-2]>a[i-1]){
                a[i]=a[i-1]+p1[i];
            }
            else{
                a[i]=a[i-1]-p1[i];
            }
        }
        else{
            return false;
        }
        mi = min(mi, a[i]);
    }
    vector<bool> ch(n, false);
    for(int i = 1; i <= n; i++){
        a[i] -= mi;
        if(a[i] < 1 || a[i] > n) return false;
        if(ch[a[i]-1]) return false;
        ch[a[i]-1] = true;
    }
    return true;
}
 
void solve(int m){
    n = m;
    int d = query(1, 2);
    for(int i = 3; i <= n; i++){
        p1[i] = query(i-1, i), p2[i] = query(i-2, i);
    }
    for(int z = -d; z <= d; z+=2*d){
        if(thu(z)){
            for(int i = 1; i <= n; i++) answer(i, a[i]);
            return ;
        }
    }
}

Compilation message (stderr)

xylophone.cpp: In function 'bool thu(int)':
xylophone.cpp:12:8: error: 'v' was not declared in this scope
   12 |     if(v < 1 || v > n) return false;
      |        ^