#include "light.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n;
vector<ll> a;
void prepare(){
n = 1;
a.push_back(1);
}
vector<ll> rev(vector<ll> v){
reverse(v.begin(), v.end());
return v;
}
std::pair<long long, std::vector<long long>> join(long long p){
n += p;
for (auto &x:a) x += p;
while(true){
ll t = a.back() - 1 - (n - a.back() + 1);
if (t <= 1) break;
a.push_back(t);
}
a.push_back(1);
return {p, rev(a)};
}
std::pair<long long, std::vector<long long>> leave(long long p){
n -= p;
vector<ll> b;
for (auto &x:a) if (x <= n) b.push_back(x);
a.clear();
a.push_back(n);
while(true){
ll t = a.back() - 1 - (n - a.back() + 1);
if (t <= 1) break;
ll mn = 4e18;
for (auto &x:b) if (x + p >= t) mn = min(mn, max(t, x));
assert(mn < a.back());
a.push_back(mn);
}
a.push_back(1);
return {p, rev(a)};
}
