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 "popa.h"
#include <iostream>
#include <vector>
using namespace std;
int solve(int n, int Lson[], int Rson[]){
for(int i=0; i<n; i++) Lson[i]=Rson[i]=-1;
vector<int> S; S.push_back(0);
for(int i=1; i<n; i++){
// for(int x:S) cout<<x<<' ';
// cout<<'\n';
if(query(i,i,S.back(),i)){
vector<int> V;
V.push_back(S.back()); S.pop_back();
while(!S.empty()){
int j=S.back();
if(!query(i,i,j,i)) break;
V.push_back(j); S.pop_back();
}
for(int i=0; i<(int)V.size()-1; i++){
Rson[V[i+1]]=V[i];
}
Lson[i]=V.back();
S.push_back(i);
}
else S.push_back(i);
}
for(int sz=S.size(), i=sz-1; i>0; i--){
Rson[S[i-1]]=S[i];
S.pop_back();
}
// for(int i=0; i<n; i++) cout<<Lson[i]<<' ';
// cout<<'\n';
// for(int i=0; i<n; i++) cout<<Rson[i]<<' ';
// cout<<'\n';
return S[0];
}
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