#include <bits/stdc++.h>
#include "mushrooms.h"
using namespace std;
#define pb push_back
int geta(int l, int r){
if( l > r) return 0;
if(l == r)
return use_machine({0,l}) == 0;
vector<int> inds;
for(int i = l; i <=r; i++)inds.pb(i);
int res = use_machine(inds);
if(res == 0){
if(use_machine({0, l})== 0)
return r - l + 1;
else
return 0;
}
else if(res == r -l){
if((r - l + 1)%2 == 0) return (r - l + 1)/2;
else {
if(use_machine({0,l}) == 0){
return (r - l + 1)/2 + 1;
}
else
return (r - l + 1)/2;
}
}
else if(res == 1){
int lo = l;
int hi = r;
int target = !use_machine({0, lo});
while(lo!= hi){
int mi = (lo + hi)/2;
if( use_machine({0,mi}) == target){
hi = mi;
}
else{
lo = mi + 1;
}
}
if(target == 1){//we were looking for the first B
return lo - 1 - l;
}
else{//we were looking for the first A
return r - lo + 1;
}
}
int mid = (l + r)/2;
return geta( l, mid) + geta(mid + 1, r);
}
int count_mushrooms(int n) {
return 1 + geta(1, n -1);
}
/************************/
