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>
using namespace std;
//#include "prize.h"
#include <vector>
int find_best(int n);
std::vector<int> ask(int i);
namespace solver{
map<int,pair<int,int> > mp;
int fin;
pair<int,int> query(int box){
if(box==-1){
return make_pair(0,-111);
}
if(mp.count(box))return mp[box];
auto z=ask(box);
if(z[0]==0&&z[1]==0){
fin=box;
}
return mp[box]=make_pair(z[0],z[1]);
}
int mx;
inline void dfs(int l,int r){
int r_cn=query(r-1).first+query(r-1).second;
int l_cn=query(l-1).first+query(l-1).second;
mx=max(mx,r_cn);
mx=max(mx,l_cn);
if(r_cn==l_cn&&query(l-1).first==query(r-1).first)return;
if(r_cn>l_cn&&query(l-1).first==query(r-1).first)return;
while(r>l&&r_cn!=mx&&fin==-1){
r--;
if(l>=r){
query(l);
return;
}
r_cn=query(r-1).first+query(r-1).second;
if(r_cn==l_cn&&query(l-1).first==query(r-1).first)return;
if(r_cn>l_cn&&query(l-1).first==query(r-1).first)return;
mx=max(mx,r_cn);
}
while(r>l&&l_cn!=mx&&fin==-1){
l++;
if(l>=r){
query(r-1);
return;
}
l_cn=query(l-1).first+query(l-1).second;
if(r_cn==l_cn&&query(l-1).first==query(r-1).first)return;
if(r_cn>l_cn&&query(l-1).first==query(r-1).first)return;
mx=max(mx,l_cn);
}
if(r<=l)return;
if(fin!=-1)return;
if(r_cn==l_cn&&query(l-1).first==query(r-1).first)return;
if(r_cn>l_cn&&query(l-1).first==query(r-1).first)return;
if(query(r-1).first==0)return;
if(l+1==r)return;
if(fin!=-1)return;
dfs(l,(l+r)>>1);
if(fin!=-1)return;
dfs((l+r)>>1,r);
}
int find_best(int n) {
fin=-1;
dfs(0,n);
return fin;
}
}
int find_best(int n) {
return solver::find_best(n);
}
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