This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include "xylophone.h"
using namespace std;
int a[5005],d[5005][5005];
void solve(int n){
int _=query(1,2);
for(int i=3; i<=n; i++) d[i-2][i]=query(i-2,i);
for(int i=2; i<=n; i++) d[i-1][i]=query(i-1,i);
for(int i=1; i<=n; i++){
a[1]=i;
for(int __=-1; __<=1; __+=2){
vector <int> vis(n+1,0);
vis[a[1]]++;
a[2]=a[1]+__*_;
if(a[2]>=1 and a[2]<=n) vis[a[2]]++;
int cnt=0;
for(int j=3; j<=n; j++){
int v=d[j-2][j];
int l=d[j-1][j];
if(v==max(a[j-1],a[j-2])-min(a[j-1],a[j-2])){
if(a[j-1]>a[j-2]) a[j]=a[j-1]-l;
else a[j]=a[j-1]+l;
}else{
int ifmin=a[j-1]-l;
int ifmax=a[j-1]+l;
if(ifmin>0 and max({a[j-2],a[j-1]})-ifmin==v) a[j]=ifmin;
else a[j]=ifmax;
}
if(a[j]>=1 and a[j]<=n) vis[a[j]]++;
}
int fir=1,last=0;
for(int j=1; j<=n; j++) if(a[j]==1) fir=j;
for(int j=1; j<=n; j++) if(a[j]==n) last=j;
if(fir>last) continue;
bool ck=1;
for(int i=1; i<=n; i++) if(vis[i]!=1) ck=0;
if(!ck) continue;
for(int i=1; i<=n; i++) answer(i,a[i]);
return;
}
}
}
Compilation message (stderr)
xylophone.cpp: In function 'void solve(int)':
xylophone.cpp:18:8: warning: unused variable 'cnt' [-Wunused-variable]
18 | int cnt=0;
| ^~~
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