#include <bits/stdc++.h>
using namespace std;
#define dbgv(v) cout<<#v<<" = "; f(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define dbga(a,x,y) cout<<#a<<" = "; f(i,x,y) cout<<a[i]<<" "; cout<<endl
#define erorp(x) cout<<#x<<"={"<<(x.F)<<" , "<<x.S<<"}"<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define all(v) v.begin(),v.end()
#define bit(n,k) (((n)>>(k))&1)
#define Add(x,y) x=(x+y)%mod
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first
#include "library.h"
const int N=2222;
int n,a[N];
vector<int> res,g[N];
vector<pair<int,int> > ans;
void dfs(int u,int p){
res.pb(u+1);
for(auto v : g[u]){
if(v==p) continue ;
dfs(v,u);
}
}
int ask(int l,int r){
vector<int> M(n);
f(i,l,r+1) M[i]=1;
int res=r-l+1-Query(M);
for(auto p : ans){
if(l<=p.F && p.F<=r && l<=p.S && p.S<=r){
res--;
}
}
return res;
}
void Solve(int _n){
n=_n;
f_(i,n-1,0){
int t=ask(i,n-1);
while(t--){
int l=i,r=n-1;
while(l+1<r){
int mid=(l+r)/2;
if(ask(i,mid)){
r=mid;
}
else{
l=mid;
}
}
int u=i,v=r;
g[u].pb(v);
g[b].pb(u);
ans.pb({u,v});
}
}
f(i,0,n){
if(g[i].size()==1 || i==n-1){
dfs(i,i);
Answer(res);
return ;
}
}
}
Compilation message
library.cpp: In function 'void Solve(int)':
library.cpp:65:6: error: 'b' was not declared in this scope
65 | g[b].pb(u);
| ^
