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 "prize.h"
#include <iostream>
#include <vector>
#include <cmath>
#define ll long long
#define pii pair<int, int>
#define xx first
#define yy second
#define pb push_back
#define MAXN 200010
using namespace std;
int n, l[MAXN], r[MAXN], maxx, ret=-1, sq=480;
vector<int> all;
/*bool check(int i, int k)
{
vector<int> p=ask(i);
int le=p[0], ri=p[1];
if ((le+ri)<maxx) return true;
if (le>k) return true;
return false;
}*/
bool vis[MAXN];
void askk(int i)
{
if (i==-1) return;
if (i==n) { l[i]=maxx; return; }
if (!vis[i]) { vector<int> p=ask(i); l[i]=p[0]; r[i]=p[1]; vis[i]=true; }
}
void ch()
{
askk(all[all.size()-1]);
if ((l[all[all.size()-1]]+r[all[all.size()-1]])==0) ret=all[all.size()-1];
}
void solve(int left, int right)
{
if (ret!=-1) return;
int mid=left+(right-left)/2;
askk(mid);
if (left>right) return;
if (left==right) { if ((l[mid]+r[mid])<maxx) all.pb(mid); ch(); return; }
if (left==(right-1))
{
if ((l[mid]+r[mid])<maxx) { all.pb(mid); ch(); if (ret!=-1) return; }
mid++;
askk(mid);
if ((l[mid]+r[mid])<maxx) { all.pb(mid); ch(); }
return;
}
if ((l[mid]+r[mid])<maxx) { all.pb(mid); ch(); if (ret!=-1) return; askk(left-1); askk(right+1); if (l[mid]-l[left-1]) solve(left, mid-1); if (l[right+1]-l[mid]-1) solve(mid+1, right); }
else
{
askk(left-1); askk(right+1);
if (l[mid]-l[left-1]) solve(left, mid-1);
if (l[right+1]-l[mid]) solve(mid+1, right);
}
}
int find_best(int N) {
n=N;
sq=min(sq, n-1);//2*sqrt(n);
for (int i=0; i<=sq; i++)
{
askk(i);
if (l[i]+r[i]==0) return i;
maxx=max(maxx, l[i]+r[i]);
}
int left=0, right=n-1;
solve(left, right);
/*int ret=0;
for (int i=0; i<all.size(); i++) { askk(all[i]); if ((l[all[i]]+r[all[i]])==0) ret=all[i]; }*/
return ret;
}
///1, 2, 5, 26, 677
/*
8
3 2 3 1 3 3 2 3
*/
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