#include "prize.h"
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define ar array
#define pb push_back
#define ln '\n'
//#define int long long
using i64 = long long;
template <class F, class _S>
bool chmin(F &u, const _S &v){
bool flag = false;
if ( u > v ){
u = v; flag |= true;
}
return flag;
}
template <class F, class _S>
bool chmax(F &u, const _S &v){
bool flag = false;
if ( u < v ){
u = v; flag |= true;
}
return flag;
}
int find_best(int n){
for ( int i = n - 1; i >= 0; i-- ){
auto c = ask(i);
if ( c[0] + c[1] == 0 ){
return i;
}
int l = 0, r = i;
while ( l < r ){
int m = (l + r) / 2;
if ( ask(m) != c ){
l = m + 1;
} else r = m;
}
i = l;
}
assert(false);
}
