#include "gap.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;
ll findGap(int T, int n)
{
vl arr;
ll l = 0;
ll r = 1e18;
rep(i,n/2)
{
ll l2;
ll r2;
MinMax(l,r,&l2,&r2);
arr.pb(l2);
arr.pb(r2);
l = l2+1;
r = r2-1;
}
if(n%2 == 1)
{
ll xd;
ll xd2;
MinMax(l,r,&xd,&xd2);
arr.pb(xd);
}
sort(all(arr));
ll ans = 0;
rep(i,siz(arr)-1) ans = max(ans,arr[i+1]-arr[i]);
return ans;
}
